When It Hits the Fan achievements

Kill 2500 enemies with the laser cannon

Kill 1000 enemies with the single pistol

Kill 2500 enemies with the chainsaw

Kill 2500 enemies with the grenade launcher

Kill 2500 enemies with the flamethrower

Kill 8 enemies with one grenade launcher round

Complete the entire Laboratory Zone on Hard mode

Kill 20 enemies at once with the laser cannon

Kill a devil with only the holy cross power-up

Kill 20 enemies by reflecting their own projectiles at them with the reflector shield

Find the secret stash in the Lab Stage 1

Complete the entire City Zone on Hard mode