Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
A booming success (30 points)	Purchase all Booby traps equipment.
A sense of sharing (15 points)	Win a Team Deathmatch.
Able to work (30 points)	Purchase all Abilities equipment.
Appetizer (15 points)	Finish the tutorial.
Arms in the air (15 points)	First weapons purchase.
Catch me if you can... (15 points)	Kill an enemy caught up in his grappling gear.
Contract signed (15 points)	Win a Contract match.
Earning your stripes (30 points)	Be promoted to Lieutenant I.
Exe-cutter (15 points)	Stab an enemy to death.
Fireworks (15 points)	Kill multiple enemies with an explosive.
Flag'n'drop (15 points)	Win a Capture the Flag game.
Grand Slam (30 points)	Win a game in each game mode.
Gun running (80 points)	Purchase all weapons.
Hot head (15 points)	Kill an enemy and yourself with a grenade.
Mine sweeping underway (15 points)	Destroy an enemy explosive.
Money walks (80 points)	Purchase all equipment.
Never two without three (30 points)	Succeed a Level III challenge.
No one in sight... (80 points)	Win a match on each map for each game mode.
No quarter (15 points)	Win a Free For All game.
Not for the faint of heart (15 points)	Stab an enemy in the back.
On familiar ground (30 points)	Win a game on each map.
On the radar (15 points)	First use of a Drone.
Out of it (15 points)	Finish off an enemy who has been stunned by a stun grenade.
Piercing eyes (15 points)	Kill an enemy through a wall.
Pineapple express (30 points)	Purchase all Projectiles equipment.
Report! (80 points)	Reach the highest rank (Commander).
Return to sender (15 points)	Kill an enemy by sending his own grenade back to him.
Scope dope (30 points)	Purchase all Scope equipment.
Shopeteer (15 points)	First equipment purchase.
Stunningly class (30 points)	Succeed all Level I challenges.
The One (15 points)	Win a Last Team Standing game.
Trigger happy (15 points)	Be promoted to Sergeant.
Very discretely (15 points)	Kill an enemy with a silencer.
What a blast! (15 points)	Kill an enemy with an explosive.
Who dares challenge me? (80 points)	Succeed at all the challenges from level 3.
You've lost your head! (15 points)	Kill an enemy with a headshot.