Demigod
Defeat the Warlord on Chapter 4 (Hard Difficulty)

Invincibility
Defeat Oblivion on Chapter 5 (Hard Difficulty)

All Weapons
Defeat Oblivion on Chapter 5 (Any Difficulty)

All Character Weapons
Defeat Oblivion on Chapter 5 (Hard Difficulty)

Infinite Ammo
Defeat Alpha Fireborn on Chapter 4 (Hard Difficulty)

All Keys
Defeat Oblivion on Chapter 5 (Any Difficulty)

Big Heads
Defeat the Oblivion Gunship on Chapter 1 (Any Difficulty)

Headless
Defeat The Xiphias on Chapter 2 (Any Difficulty)

Shorty
Defeat The Xiphias on Chapter 2 (Any Difficulty)

Skinny
Defeat the Opisthor on Chapter 3 (Any Difficulty)

Big Hands & Feet
Defeat the Oblivion Gunship on Chapter 1 (Any Difficulty)