Detonate 50 bombs with a single shot
Reach 2 000 points without missing a single shot.
Kill 400 scorpions
Complete all challenges in coop mode
Kill 10 enemies with a single shot from a railgun
Reach 20 000 points in arcade mode
Reach 40 000 points in arcade mode
Kill 15 enemies in rapid succession
Survive 3 minutes
Kill 1000 centipedes
Complete all challenges in a single player mode
Resurrect an ally in coop mode
Kill 800 spiders
Kill the enemy without doing damage to it
Reach 30 000 points in arcade mode
Kill 600 fleas