Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Baiter Bane ( 20 points )	During an Xbox Live Co-op game, kill five baiters in any level without using any smart bombs.
Competitive ( 15 points )	Win 30 Xbox Live versus games.
Cooperation ( 10 points )	Get a score of 15,000 during an Xbox Live Co-Op game.
Fifteen Grand ( 15 points )	Get a personal score of 15,000.
Five Waves ( 20 points )	Make it to the fifth wave.
Getting Better ( 15 points )	Make it to the third wave.
Mutant ( 10 points )	Shoot five mutants in one game.
Nice Catch ( 15 points )	Rescue a human with a mid-air catch.
One Wave ( 10 points )	Make it to the second wave without losing any humans.
Protect All Humans ( 25 points )	Lose no humans in the first three waves.
Run! ( 20 points )	Survive the first 75 seconds without shooting, bombing, or teleporting.
Twenty-Five Grand ( 25 points )	Obtain a personal score of 25,000.