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