Reach 2000 points without missing a single shot

Reach 20000 points in arcade mode

Reach 30000 points in arcade mode

Reach 40000 points in arcade mode

Complete all challenges in a single player mode

Complete all challenges in coop mode

Survive for 180 seconds

Resurrect an ally in coop mode

Kill 15 enemies in rapid succession

Kill the enemy without doing damage to it

Kill 10 enemies with a single shot from a railgun

Detonate 50 bombs with a single shot

Kill 1000 centipedes

Kill 400 scorpions

Kill 600 fleas

Kill 800 spiders