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