Team Work
10Score 100,000 points in an Xbox Live Co-op game.
Unlocked: 03 Aug 2007 23:35:00
Tough Guy
20Get to the second tunnel without obtaining a single weapon upgrade.
Unlocked: 03 Aug 2007 23:26:07
Infiltration
15Destroy the alien tower at the end of the water level.
Unlocked: 31 Jul 2007 23:24:13
Armory
10Collect 4 different weapon power-ups.
Unlocked: 31 Jul 2007 23:22:02
Untouchable
10Get to the first tunnel without losing a life.
Unlocked: 31 Jul 2007 23:18:52
Beat the first timed tunnel with 33 seconds or more left.
Unlocked: 31 Jul 2007 23:13:39
Beat the second timed tunnel with 55 seconds or more left.
Collect 3 different weapons in the second tunnel.
Proficient
20Complete the second tunnel with a score of 100,000 or more in Arcade mode.
Partnership
20Complete the game in Xbox Live Co-op mode.
Bulletproof
25Complete the game in Arcade mode using only 1 credit.
Full Assault
30Complete the game in under 12 minutes.