Here is the full list of achievements for Halo Wars for the Xbox 360.
2 Bugs are Better Than 1 (10 points) – Win a Skirmish Game with Dual Scarabs
24 Hours of Quality (20 points) – Play Halo Wars for at least 24 Total Hours
Adjudicate the Arbiter (30 points) – Complete the Campaign on Heroic Difficulty
Alas, Poor Andrew Thomas (5 points) – Collect your first Skull
Backscratcher (10 points) – Complete any Campaign Mission in Co-op Mode
Basically Naive (10 points) – Obtain the Recruit Rank on Xbox LIVE
Battened Down the Hatches (5 points) – Mission 11 – Save all the Airlocks
Beaming with Pride (5 points) – Mission 13 – Destroy 25 units with the Scarab
Big Al’s Scooter (10 points) – Win a Heroic Skirmish Game against the AI in under 10 minutes
Covenant “Hot Drop” (5 points) – Mission 3 – Kill at least 5 Covenant Units with the Bridge
Crushed Colors (10 points) – Improve your Score in any Campaign Mission
Detour the Great Journey (50 points) – Complete the Campaign on Legendary Difficulty
Didn’t Get To Second Base (5 points) – Mission 14 – Don’t claim an extra base
Empire Builder (5 points) – Win a game in every Skirmish Game Mode
Endless Fun (5 points) – Mission 2 – Destroy every Methane Tank
Epic Grinder (40 points) – Obtain a Lifetime Campaign Score over 1,000,000
Everything’s Better with Bacon (5 points) – Mission 1 – Ram 50 Grunts with Warthogs
Gallivant around the Galaxy (25 points) – Win a game on every Skirmish Map
Graverobber (30 points) – Collect all Skulls
Halo Academic (15 points) – Unlock 20 Timeline Events
Halo Historian (40 points) – Unlock All Timeline Events
Handy with Tools (5 points) – Mission 12 – Repair the Power Core in less than 4 minutes
He’s Got The Jack (5 points) – Mission 5 – Jack 6 Covenant Vehicles
Micro Manager (5 points) – Mission 7 – Do not destroy any Power Node
Momma’s Boy (5 points) – Get a Gold Medal on any mission
Mr. Punctual (15 points) – Finish all missions under Par Time on Heroic difficulty
My Virtual Friends Love Me (10 points) – Win a 3v3 Skirmish game with 2 AI Allies
N00b n0 M0r3 (10 points) – Win a Matchmade Skirmish Game on Xbox LIVE
Officer on Deck (30 points) – Obtain the Lieutenant Rank on Xbox LIVE
OMG BFF FTW (40 points) – Complete entire Campaign in Co-op Mode
Own Worst Enemy (20 points) – Get a Gold Medal with all Debuff Skulls Active
Penny Pincher (10 points) – Get a winning High Score with 10 or less Squads against the Heroic AI
Playin’ the Field (15 points) – Win a Skirmish Game with every Leader
Ramblin’ Man (5 points) – Mission 8 – Use Elephants to train 100 Infantry
Ready for the Sequel (75 points) – 100% Completion
Rhino Hugger (5 points) – Mission 6 – Successfully protect every Rhino
Running the Show (50 points) – Obtain the General Rank on Xbox LIVE
So Lonely at the Top (20 points) – Win and have the Highest Score in a Matchmade Skirmish Game on Xbox LIVE
Sweet Naptime (5 points) – Mission 9 – Put every Colony in Hibernation Mode at the same time
The Procrastinator (5 points) – Mission 10 – Disrupt all Tractor Beams
The Real Winner (5 points) – Mission 4 – Save Adam
Thinkin’ about My Doorbell (5 points) – Mission 15 – Open the Doors in order
Titan (15 points) – Get 20,000 points in any Skirmish Game
Walk-Off Winner (30 points) – Use one of the 6 Major Leader Powers to destroy an enemy’s last unit
Wall of Recognition (30 points) – Get a Gold Medal on every Campaign Mission
Additionally, there are five secret achievements for a total of 240 gamer points:
Ice Warriors (40 points) – Complete Act I on any difficulty
Key to Pirth (50 points) – Complete Act II on any difficulty
Meet Sergeant Forge (10 points) – Complete the first mission on any difficulty
No Way Home? (70 points) – Complete Act IV on any difficulty
Ugly is only Skin Deep (70 points) – Complete Act III on any difficulty