Defeated Mariska.

Defeated Zed.

Pick up 1,000 zombie medals.

Defeated Hazmat in Prologue.

Kill the Nightmare Queen

150 kills with fire

Kill an enemy with a double ricochet

Open 50% of the chests in the game

Execute the fire/wind/arcane combo

Freeze yourself with a reflected ice bolt

Hit an enemy simultaneously with a curved bolt and a straight bolt

Take damage from a reflected arcane bolt