Complete the game in Arcade mode using only 1 credit.
Complete the second tunnel with a score of 100,000 or more in Arcade mode.
Collect 3 different weapons in the second tunnel.
Complete the game in under 12 minutes.
Complete the game in Xbox Live Co-op mode.
Get to the second tunnel without obtaining a single weapon upgrade.
Beat the second timed tunnel with 55 seconds or more left.
Destroy the alien tower at the end of the water level.
Score 100,000 points in an Xbox Live Co-op game.
Get to the first tunnel without losing a life.
Beat the first timed tunnel with 33 seconds or more left.
Collect 4 different weapon power-ups.
