Complete a level without taking damage

Buy all character improvements, drone and night vision goggles

Use all forms of weaponry

Kill at least one monster of every type

Find the secret area

Survive 5 minutes in Survival mode

Complete the first episode on any difficulty

Complete the first episode on maximum difficulty

Kill 1,000,000 monsters

Survive 5 minutes in Survival mode using pistols only

Survive 15 minutes in Survival mode

Complete the first episode without dying once