Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
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.