Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Cash is King (10 points)	Achieve a balance of 20000 credits or more.
Co-op Campaigner (10 points)	Complete any multiplayer level.
Deadly Assassin (10 points)	Kill 50 aliens in a row in single player without taking damage.
Indestructible (40 points)	Finish multiplayer level 'Cargo' without taking any damage.
Old Soldier (20 points)	Complete all single player levels 1-5.
Praemonitus Praemunitus (10 points)	Collect all the logs throughout the game.
Rapid Deployment (10 points)	Complete multiplayer level 'Cargo' in 10:00 or less.
Super-Sleuth (10 points)	Find all secret collectibles.
Survivor (10 points)	Stay alive for 8 minutes on any of the Survival mode single player levels.
The Best of the Best (25 points)	Complete all single player levels 1-5 on Elite difficulty.
Vital Statistics (25 points)	Finish 'Primed' single player level with a score greater than 300,000.
War of Attrition (20 points)	Kill 1000 aliens in single player.