Have 50 asteroids in the level at the same time
Kill an enemy with a deflected bullet
Kill 20 enemies in rapid succession
Survive for 180 seconds
Reach 6000 points in arcade mode
Kill 1000 asteroids
Reach 4000 points in arcade mode
Reach 2000 points in arcade mode
Reach 500 points without missing a single shot
Reach 1000 points without moving
Kill 30 enemies with a single mega laser
Detonate 30 bombs with a single shot
Kill 1000 UFOs
Complete all challenges in a single player mode
Complete all challenges in coop mode
Resurrect an ally in coop mode
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