Complete Phase 4: The Meat Factory.

Splat 100 enemies on a wall with a weapon.

Complete Phase 2: The Doll that Bled.

Kill an enemy with an enemy's head.

Purchase a skill.

Get 50 kills with non-fleshy weapons.

Kill an enemy with your own dismembered arm.

Perform a Splatterkill.

Unlock all Time Trial stretches

Activate the Portal deck, felt, and chips simultaneously.

Win GLaDOS's bounty item.

Activate the Army of Darkness deck, felt, and chips simultaneously.