Treasure Unlockables
Unlockable How to Unlock
Challenge of Hades Beat the game on any difficulty.
God Mode Beat the game on any difficulty.
In-Game Movies Beat the game on any difficulty.
The Lost Levels Beat the Challenge of Hades.
Making of Attica Beat the game in God mode.
Inside Ready at Dawn Studios Beat the game on any difficulty.
Character Concept Art Beat the game on any difficulty.
Environments Concept Art Beat the Challenge of Hades.
Outtakes Concept Art Beat the game in God mode.

Unlockable Costumes
Costumes can selected only when selecting a new game, (must beat God mode to use costumes in God mode)

Unlockable How to Unlock
Spud of War (skill: Magic) Beat the game on any difficulty
McKratos (skill:Attack) Finish all 5 missions of the Challenge of Hades
Mime of War (skill:Red orbs) Beat the game on God mode