Defeat a Crimson Head.

Complete Chapter 1 of INTERmission.

Defeat a zombie.

Collect all the Happy Turtle flyers.

Finish the Game on Normal Without Changing the Difficulty

Kill 30 Enemies with the Arm Micro

Find 40 Treasures

Kill 100 Enemies with Headshots

Kill 20 Enemies with Gunfire While Hanging

Find 20 Treasures

Defeat 20 Enemies by Blind-Firing While in Cover (without aiming)

Defeat 50 Enemies with Hand-to-Hand Combat

Destroy 200 breakable objects.