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Born to Kill
10
Kill a total of 25 aliens in single player
Team Veteran
20
Complete "Hydroponics" in Co-op Assault
Hard to Kill
20
Complete CO-OP Assault level 1, 2 or 3 without either player dying
Campaign Veteran
Complete all single player levels 1-5
Fighting Light
Complete any single player level without using any items
Against the Odds
Complete single player levels 1-5 on Elite difficulty
Ain't got time to bleed!
Complete 'Interface' single player mission without using a health pack
Knowledge is Power
Collect all the logs throughout the game
Break Out the Arsenal
Fire every weapon and use every item in single player
Killing Spree
Kill 20 aliens within 30 seconds in single player
No Stone Unturned
Find all secret collectibles
Elite Force
10
Kill 50 aliens in a row without taking damage in single player
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