In Gears of War 3, you will earn medals over time for certain accomplishments, like getting headshots, completing matches, etc. Some medals are tied to unlockables, and some are going to be much harder to obtain than others.
Here is the full list of medals, and how to unlock them.
Abductor: Awarded for capturing enemy leaders
Bronze – Capture 25 enemy leaders
Silver – Capture 100 enemy leaders
Gold – Capture 250 enemy leaders
Onyx – Capture 500 enemy leaders
Active Reloader: Awarded for performing perfect Active Reloads
Bronze – 500 perfect Active Reloads
Silver – 2,500 perfect Active Reloads
Gold – 10,000 perfect Active Reloads
Onyx – 25,000 perfect Active Reloads
Aficionado: Awarded for playing chapters of Arcade
Bronze – Play 50 chapters of Arcade
Silver – Play 150 chapters of Arcade
Gold – Play 300 chapters of Arcade
Onyx – Play 500 chapters of Arcade
Allfathers: Awarded for playing a certain number of matches in all versus game modes
Bronze – Play 100 matches in all versus game modes
Silver – Play 300 matches in all versus game modes
Gold – Play 1000 matches in all versus game modes
Onyx – Play 3000 matches in all versus game modes
Architect: Awarded for earning Founder ribbons
Bronze – Earn 10 Founder ribbons
Silver – Earn 50 Founder ribbons
Gold – Earn 150 Founder ribbons
Onyx – Earn 300 Founder ribbons
Assistant: Awarded for getting assists in Versus multiplayer
Bronze – Get 125 assists in Versus matches
Silver – Get 500 assists in Versus matches
Gold – Get 2,000 assists in Versus matches
Onyx – Get 5,000 assists in Versus matches
Battle Mistress: Awarded for playing matches as a female character
Bronze – Play 25 matches as a female character
Silver – Play 100 matches as a female character
Gold – Play 500 matches as a female character
Onyx – Play 1000 matches as a female character
Beastly: Awarded for completing a certain number of waves of Beast
Bronze – Complete 60 waves of Beast
Silver – Complete 180 waves of Beast
Gold – Complete 360 waves of Beast
Onyx – Complete 600 waves of Beast
Beta Tester: Participate in the Beta
Onyx – Participate in the Beta
Big Money: Awarded for earning cash in Horde mode
Bronze – Earn $100,000 in Horde mode
Silver – Earn $500,000 in Horde mode
Gold – Earn $1,000,000 in Horde mode
Onyx – Earn $5,000,000 in Horde mode
Captor: Awarded for killing enemies with a captive
Bronze – Kill 50 enemies with a captive
Silver – Kill 200 enemies with a captive
Gold – Kill 500 enemies with a captive
Onyx – Kill 1000 enemies with a captive
Cover: Awarded for earning Buttoned-Up ribbons
Bronze – Earn 10 Buttoned-Up ribbons
Silver – Earn 50 Buttoned-Up ribbons
Gold – Earn 200 Buttoned-Up ribbons
Onyx – Earn 600 Buttoned-Up ribbons
CTL: Awarded for playing Capture The Leader matches
Bronze – Play 100 CTL matches
Silver – Play 300 CTL matches
Gold – Play 1000 CTL matches
Onyx – Play 3000 CTL matches
Dismantler: Awarded for destroying fortifications in Beast mode
Bronze – Destroy 150 fortifications in Beast
Silver – Destroy 500 fortifications in Beast
Gold – Destroy 1,500 fortifications in Beast
Onyx – Destroy 3,000 fortifications in Beast
Doorman: Awarded for manipulating objects in Campaign mode
Bronze – Manipulate 200 objects in Campaign
Silver – Manipulate 500 objects in Campaign
Gold – Manipulate 1,000 objects in Campaign
Onyx – Manipulate 2,000 objects in Campaign
Embry Star: Awarded for earning Onyx medals
Onyx – Earn 30 Onyx medals
Execution: Awarded for playing Execution matches
Bronze – Play 100 Execution matches
Silver – Play 300 Execution matches
Gold – Play 1,000 Execution matches
Onyx – Play 3,000 Execution matches
Explosives: Awarded for kills with explosives
Bronze – Get 100 kills with explosives
Silver – Get 500 kills with explosives
Gold – Get 2,000 kills with explosives
Onyx – Get 6,000 kills with explosives
Field Engineer: Awarded for completing fortification modifications
Bronze – Complete 100 fortification modifications
Silver – Complete 250 fortification modifications
Gold – Complete 500 fortification modifications
Onyx – Complete 1,000 fortification modifications
Field Service: Awarded for reaching certain levels
Bronze – Reach level 25
Silver – Reach level 50
Gold – Reach level 75
Onyx – Reach level 100
Finisher: Awarded for pulling off executions
Bronze – Get 100 executions
Silver – Get 500 executions
Gold – Get 2,000 executions
Onyx – Get 6,000 executions
For The Horde!: Awarded for completing all 50 waves of Horde on a certain difficulty
Bronze – Complete all 50 waves of Horde on Casual difficulty
Silver – Complete all 50 waves of Horde on Normal difficulty
Gold – Complete all 50 waves of Horde on Hardcore difficulty
Onyx – Complete all 50 waves of Horde on Insane difficulty
Force Multiplier: Awarded for maintaining max multiplier in Arcade chapters
Bronze – Maintain the max multiplier in 10 chapters of Arcade
Silver – Maintain the max multiplier in 30 chapters of Arcade
Gold – Maintain the max multiplier in 60 chapters of Arcade
Onyx – Maintain the max multiplier in 100 chapters of Arcade
Gnasher Shotgun: Awarded for kills with the Gnasher Shotgun
Bronze – Get 100 kills with the Gnasher Shotgun
Silver – Get 500 kills with the Gnasher Shotgun
Gold – Get 2,000 kills with the Gnasher Shotgun
Onyx – Get 6,000 kills with the Gnasher Shotgun
Guardian: Awarded for rescuing leaders in Capture The Leader
Bronze – Rescue 50 leaders in CTL
Silver – Rescue 250 leaders in CTL
Gold – Rescue 600 leaders in CTL
Onyx – Rescue 1,200 leaders in CTL
Hammerburst: Awarded for kills with the Hammerburst
Bronze – Get 100 kills with the Hammerburst
Silver – Get 500 kills with the Hammerburst
Gold – Get 2,000 kills with the Hammerburst
Onyx – Get 6,000 kills with the Hammerburst
Hard Target: Awarded for earning Last Man Out ribbons
Bronze – Earn 100 Last Man Out ribbons
Silver – Earn 300 Last Man Out ribbons
Gold – Earn 1,000 Last Man Out ribbons
Onyx – Earn 3,000 Last Man Out ribbons
Headshot: Awarded for getting headshots
Bronze – Get 100 headshots
Silver – Get 300 headshots
Gold – Get 1500 headshots
Onyx – Get 4500 headshots
Heavy Weapons: Awarded for kills with heavy weapons
Bronze – Get 100 heavy weapon kills
Silver – Get 500 heavy weapon kills
Gold – Get 2000 heavy weapon kills
Onyx – Get 6000 heavy weapon kills
High Roller: Awarded for earning Ready For The Heavies ribbons
Bronze – Earn 5 Ready For The Heavies ribbons
Silver – Earn 15 Ready For The Heavies ribbons
Gold – Earn 35 Ready For The Heavies ribbons
Onyx – Earn 75 Ready For The Heavies ribbons
Horder: Awarded for completing a certain number of waves on Horde
Bronze – Complete 100 waves on Horde
Silver – Complete 500 waves on Horde
Gold – Complete 1,000 waves on Horde
Onyx – Complete 2,000 waves on Horde
I’m A Beast!: Awarded for completing Beast mode without failing
Bronze – Complete Beast mode on Casual difficulty without failing
Silver – Complete Beast mode on Normal difficulty without failing
Gold – Complete Beast mode on Hardcore difficulty without failing
Onyx – Complete Beast mode on Insane difficulty without failing
Investor: Awarded for earning cash in Beast
Bronze – Earn $100,000 in Beast mode
Silver – Earn $250,000 in Beast mode
Gold – Earn $500,000 in Beast mode
Onyx – Earn $1,000,000 in Beast mode
It Has Begun!: Complete one versus match
Onyx – Complete one versus match
King of COG: Awarded for earning points in Arcade mode
Bronze – Earn 1,000,000 total points in Arcade mode
Silver – Earn 2,000,000 total points in Arcade mode
Gold – Earn 5,000,000 total points in Arcade mode
Onyx – Earn 7,500,000 total points in Arcade mode
KOTH: Awarded for playing King of the Hill matches
Bronze – Play 100 King of the Hill matches
Silver – Play 300 King of the Hill matches
Gold – Play 1,000 King of the Hill matches
Onyx – Play 3,000 King of the Hill matches
Lancer: Awarded for kills with the Lancer
Bronze – Get 100 kills with the Lancer
Silver – Get 500 kills with the Lancer
Gold – Get 2000 kills with the Lancer
Onyx – Get 6000 kills with the Lancer
Leader: Awarded for earning Untouchable ribbons
Bronze – Earn 25 Untouchable ribbons
Silver – Earn 100 Untouchable ribbons
Gold – Earn 500 Untouchable ribbons
Onyx – Earn 1,500 Untouchable ribbons
Loot Courtesan: Awarded for completing challenges in Horde mode
Bronze – Complete 10 challenges in Horde
Silver – Complete 20 challenges in Horde
Gold – Complete 50 challenges in Horde
Onyx – Complete 100 challenges in Horde
Master-At-Arms: Awarded for getting kills with all five starting weapons
Bronze – Get the Bronze medal (100 kills) with all five starting weapons
Silver – Get the Silver medal (500 kills) with all five starting weapons
Gold – Get the Gold medal (2,000 kills) with all five starting weapons
Onyx – Get the Onyx medal (6,000 kills) with all five starting weapons
Match Winner: Awarded for winning multiplayer matches
Bronze – Win 50 multiplayer matches
Silver – Win 250 multiplayer matches
Gold – Win 1,000 multiplayer matches
Onyx – Win 3,000 multiplayer matches
Medic: Awarded for reviving squad-mates
Bronze – Revive 50 squad-mates
Silver – Revive 250 squad-mates
Gold – Revive 600 squad-mates
Onyx – Revive 1,200 squad-mates
Motivator: Awarded for healing or reviving teammates in Beast
Bronze – Heal or revive 250 teammates in Beast
Silver – Heal or revive 500 teammates in Beast
Gold – Heal or revive 750 teammates in Beast
Onyx – Heal or revive 1,500 teammates in Beast
MVP: Awarded for earning MVP ribbons
Bronze – Earn 5 MVP ribbons
Silver – Earn 25 MVP ribbons
Gold – Earn 100 MVP ribbons
Onyx – Earn 500 MVP ribbons
Number 1: Awarded for placing first in Arcade mode
Bronze – First place in Arcade 20 times
Silver – First place in Arcade 60 times
Gold – First place in Arcade 120 times
Onyx – First place in Arcade 240 times
Old Guard: Earn the Veteran Gear achievement in Gears of War 2
Onyx – Earn the Veteran Gear achievement in Gears of War 2
Old Schooler: Awarded for curb stomping enemies
Bronze – Curb stomp 50 enemies
Silver – Curb stomp 250 enemies
Gold – Curb stomp 1,000 enemies
Onyx – Curb stomp 3,000 enemies
Pistols: Awarded for kills with the Pistol
Bronze – Get 100 pistol kills
Silver – Get 500 pistol kills
Gold – Get 2,000 pistol kills
Onyx – Get 6,000 pistol kills
Pyro: Awarded for killing enemies with fire
Bronze – Kill 50 enemies with fire
Silver – Kill 300 enemies with fire
Gold – Kill 1,000 enemies with fire
Onyx – Kill 3,000 enemies with fire
Retro Lancer: Awarded for kills with the Retro Lancer
Bronze – Get 100 kills with the Retro Lancer
Silver – Get 500 kills with the Retro Lancer
Gold – Get 2,000 kills with the Retro Lancer
Onyx – Get 6,000 kills with the Retro Lancer
Rifleman: Awarded for getting a certain number of kills with all three starting rifles in versus matches
Bronze – Get the Bronze medal (100 kills) with all three starting rifles
Silver – Get the Silver medal (500 kills) with all three starting rifles
Gold – Get the Gold medal (2,000 kills) with all three starting rifles
Onyx – Get the Onyx medal (6,000 kills) with all three starting rifles
Ruthless: Awarded for killing humans in Beast
Bronze – Kill 125 humans in Beast
Silver – Kill 325 humans in Beast
Gold – Kill 650 humans in Beast
Onyx – Kill 1,100 humans in Beast
Sapper: Awarded for destroying enemy grenades
Bronze – Destroy 10 enemy grenades
Silver – Destroy 50 enemy grenades
Gold – Destroy 200 enemy grenades
Onyx – Destroy 1,000 enemy grenades
Sawed-Off Shotgun: Awarded for kills with the Sawed-off Shotgun
Bronze – Get 100 Sawed-off Shotgun Kills
Silver – Get 500 Sawed-off Shotgun Kills
Gold – Get 2,000 Sawed-off Shotgun Kills
Onyx – Get 6,000 Sawed-off Shotgun Kills
Seriously: Earn the Seriously 3.0 Achievement
Onyx – Earn the Seriously 3.0 Achievement
Shock Trooper: Awarded for earning First Blood ribbons
Bronze – Earn 100 First Blood ribbons
Silver – Earn 300 First Blood ribbons
Gold – Earn 1,000 First Blood ribbons
Onyx – Earn 3,000 First Blood ribbons
Skunker: Awarded for skunking the enemy team
Bronze – Skunk the enemy team 25 times
Silver – Skunk the enemy team 100 times
Gold – Skunk the enemy team 500 times
Onyx – Skunk the enemy team 2,500 times
Sovereign: Awarded for winning Capture The Leader rounds as the leader
Bronze – Win 25 CTL rounds as the leader
Silver – Win 100 CTL rounds as the leader
Gold – Win 250 CTL rounds as the leader
Onyx – Win 500 CTL rounds as the leader
Special Teams: Awarded for getting map-based weapon kills
Bronze – Get 100 map-based weapon kills
Silver – Get 500 map-based weapon kills
Gold – Get 2,000 map-based weapon kills
Onyx – Get 6,000 map-based weapon kills
Spotter: Awarded for spotting enemies
Bronze – Spot 250 enemies
Silver – Spot 1,000 enemies
Gold – Spot 5,000 enemies
Onyx – Spot 12,000 enemies
Squad Leader: Awarded for earning Point Man ribbons
Bronze – Earn 50 Point Man ribons
Silver – Earn 150 Point Man ribons
Gold – Earn 300 Point Man ribons
Onyx – Earn 500 Point Man ribons
Survivalist: Awarded for completing chapters without dying
Bronze – Complete 20 chapters without dying
Silver – Complete 60 chapters without dying
Gold – Complete 120 chapters without dying
Onyx – Complete 240 chapters without dying
TDM: Awarded for playing Team Deathmatch matches
Bronze – Play 100 Team Deathmatch matches
Silver – Play 300 Team Deathmatch matches
Gold – Play 1,000 Team Deathmatch matches
Onyx – Play 3,000 Team Deathmatch matches
Tour of Duty: Awarded for completing Campaign
Bronze – Complete Campaign on Casual difficulty
Silver – Complete Campaign on Noraml difficulty
Gold – Complete Campaign on Hardcore difficulty
Onyx – Complete Campaign on Insane difficulty
Vengeful: Awarded for executing nemeses
Bronze – Execute 75 nemeses
Silver – Execute 150 nemeses
Gold – Execute 300 nemeses
Onyx – Execute 500 nemeses
Veteran: Awarded for playing multiplayer matches
Bronze – Play 100 matches
Silver – Play 500 matches
Gold – Play 2,000 matches
Onyx – Play 4,000 matches
War Supporter: Awarded for playing in official Gears of War events
Bronze – Play in 5 official Gears of War events
Silver – Play in 10 official Gears of War events
Gold – Play in 20 official Gears of War events
Onyx – Play in 30 official Gears of War events
Warmonger: Awarded for completing all Arcade chapters
Bronze – Complete Arcade on Casual difficulty
Silver – Complete Arcade on Noraml difficulty
Gold – Complete Arcade on Hardcore difficulty
Onyx – Complete Arcade on Insane difficulty
Warzone: Awarded for playing Warzone matches
Bronze – Play 100 Warzone matches
Silver – Play 300 Warzone matches
Gold – Play 1,000 Warzone matches
Onyx – Play 3,000 Warzone matches
Wingman: Awarded for playing Wingman matches
Bronze – Play 100 Wingman matches
Silver – Play 300 Wingman matches
Gold – Play 1,000 Wingman matches
Onyx – Play 3,000 Wingman matches
