Here is the full list of unlockable achievements in Warhammer 40,000: Space Marine for the Xbox 360.
Angel of Death (20) – Kill 500 enemies using Ranged weapons
Armored in Glory (15) – Complete 10 armor challenges
Battle Brother (10) – Get a Multiplayer character to Lvl 10
Blast Radius (5) – Multi-kill 5 enemies with 1 Frag grenade.
Brute Force…Unleashed (5) – Complete a Chapter of the single-player game using only the Vengeance Launcher and Power Axe
Burn Them All (5) – Complete a Chapter of the single-player campaign using only Plasma weapons
Captain (20) – Get a Multiplayer character to Lvl 30
Chain of Death (10) – Multi-kill — Detonate a chain of 5 consecutive Vengeance Launcher rounds, killing 10 enemies
Chapter Master (30) – Get a Multiplayer character to Lvl 40
Death from Above (15) – Kill 25 enemies with Ground Pound
Defender (10) – Kill 25 opponents who are capturing your Control Point in Seize Ground
Devastation! (25) – Have 10 times more kills than deaths in a single game of Annihilation
Down to Earth (30) – Kill 50 Assault Marines/Raptors in mid-air
Feel My Wrath (30) – Kill 250 enemies using Melee Fury attacks
Finesse and Fury (5) – Complete a Chapter of the single-player game using only Stalker-Pattern Bolter and Chainsword
Firepower (10) – Kill 250 enemies using Exotic weapons
Glorious Slaughter (10) – Kill 75 enemies using Executions
Jack of All Trades (25) – Play 10 Multiplayer games using each class
Keeper of the Armory (30) – Complete all the weapon challenges
Lexicanum (10) – Collect 10 Servo Skulls
Librarian of Macragge (75) – Collect all Servo Skulls
Master Crafted (10) – Fully customize a Space Marine and a Chaos Space Marine character
Master of Arms (20) – Complete 5 weapon challenges
Master of Sword and Gun (5) – Complete a Chapter of the single-player campaign using only the Bolt Pistol and Chainsword
Master of the Clean Kill (30) – Get 250 Headshots
Nob Down (20) – Win 10 struggles against the Ork Nob
None Can Stand Before You (125) – Complete the entire game on Hard difficulty
Not So Tough (20) – Kill 10 ‘Ard Boyz
Precision Killer (5) – Multi-kill 2 enemies with 1 Stalker-Pattern bolter shot
Put Them Down (10) – Get 100 Headshots
Shapeshifter (10) – Play each class in Multiplayer
Shock & Awe (20) – Kill 150 enemies using the Charge attack
Success is Measured in Blood (20) – Kill 500 enemies using Melee weapons
The Bigger They Are… (20) – Kill 25 Ork Nobs
The Emperor Protects (25) – Complete Part 1 of the game on Hard difficulty in a single session without dying or restarting
The Emperor’s Marksman (20) – Kill 10 enemies in a row in a single Ranged Fury activation
The Might of the Righteous (5) – Kill 100 enemies
True Son of the Emperor (75) – Kill 40,000 enemies in the game (all game modes combined)
Veteran (15) – Get a Multiplayer character to Lvl 20
Visible, Violent Death (30) – Kill 2500 enemies
Warrior of Darkness and Light (15) – Play 10 Multiplayer games as Space Marine and 10 Multiplayer games as Chaos Marine
Here are the nine secret achievements you can unlock in the game:
But I Am Finished With You (10) – Kill Warboss Grimskull once and for all
Command Squad (10) – Reunite with your Space Marine brothers
Die, Heretics (20) – Kill 50 Chaos Space Marines
Hammer of the Imperium (10) – Use the Invictus to destroy the Orbital Spire
Here, At the End of All Things (20) – Kill Daemon Prince Nemeroth
Into the Breach (10) – Fight your way to the crashed Rok
Silence the Cannon (10) – Destroy the Orbital Gun
We Take Our Chances (10) – Fire the Psychic Scourge
You Must Carry It (5) – Retrieve the Power Source