Use Jef's highly explosive rocket launcher to explode 15 enemies on a single level

Complete any level without leaving any saveable team members behind

Complete any level with 30 seconds remaining on the clock

Die within 3 seconds of spawning

Kill Satan with Cain

Kill Mom's Heart 3 times

Create your first invention.

Escape the circus tent.

Get the XXL BOB

Kill 100 zombies

Kill your first zombie with a Molotov Cocktail

Beat the Basement 40 times