Kill 20 enemies in rapid succession

Reach 4000 points in arcade mode

Kill an enemy with a deflected bullet

Reach 1000 points without moving

Unlock all trophies

Complete all challenges in a single player mode

Kill 400 scorpions

Kill 10 enemies with a single shot from a railgun

Kill the enemy without doing damage to it

Reach 30 000 points in arcade mode

Kill 1000 centipedes

Survive 180 seconds

Complete all stages of "Melinoe" in "Into That Pale Wasteland."