Kill 5 enemies with Grenade bug explosion
Prevent 100 eggs from hatching
Push down the egg
Kill 10 Thunderbugs in rapid succession
Kill 2000 Bugs
Kill 15 enemies with a single shot from a railgun
Reach 4000 points in arcade mode
Kill 20 enemies in rapid succession
Reach 2000 points in arcade mode
Complete all challenges in coop mode
Reach 6000 points in arcade mode
Complete all challenges in a single player mode
Resurrect an ally in coop mode
Survive for 180 seconds