Beat the first timed tunnel with 33 seconds or more left.

Collect 4 different weapon power-ups.

Destroy the alien tower at the end of the water level.

Get to the first tunnel without losing a life.

Collect 3 different weapons in the second tunnel.

Beat the second timed tunnel with 55 seconds or more left.

Score 100,000 points in an Xbox Live Co-op game.

Get to the second tunnel without obtaining a single weapon upgrade.

Complete the second tunnel with a score of 100,000 or more in Arcade mode.

Complete the game in Xbox Live Co-op mode.

Complete the game in under 12 minutes.

Complete the game in Arcade mode using only 1 credit.