Complete the game on the hardest difficulty setting

Kill 30 enemies with the Contact Beam

Kill 30 enemies with the Flamethrower

Beat the game using only the Plasma Cutter

Escape from a Lurker's grab attack 10 times

Kill the Slug Boss with more than 50% Shield strength remaining

Complete Chapter 12 on any difficulty setting

Complete Chapter 11 on any difficulty setting

Find the Peng Treasure

Dismember 1000 Limbs

Complete Chapter 9 on any difficulty setting

Zero-G Jump over 100 times