Steam achievements:
ACHIEVEMENT – HOW TO UNLOCK
Against The Odds – Completed the Single Player game on Elite difficulty.
Aint Got Time To Bleed – Finished “Interface” single player level without using any health packs.
Born to Kill – Killed a total of 25 aliens in single player.
Break Out The Arsenal – Used all weapons and items in the game.
Campaign Veteran – Single player completed.
Elite Force – Killed 50 aliens in a row without taking any damage.
Fighting Light – Finished a single player level without using any items.
Hard To Kill – Finished Co-op Assault level 1, 2 or 3 with no player losing a life.
Killing Spree – Killed 20 aliens in 30 seconds.
Knowledge Is Power – Picked up 100% of the logs.
No Stone Unturned – Found all secret collectibles.
Team Veteran – Complete “Hydroponics” in Co-op Assault.
