Credits
Complete the game once under any difficulty setting.

Deleted Levels
Complete the game once under any difficulty setting.

Heroic Possibilities
Complete the game once under any difficulty setting.

Visions of Ancient Greece
Complete the game once under any difficulty setting.

Monsters of Myth
Complete the game once under any difficulty setting.

Birth of the Beast
Complete the game once under any difficulty setting.

God Mode
Complete the game once under any difficulty setting.

Character Graveyard
Complete the game once under any difficulty setting.

Challenge of the Gods
Complete the game once under any difficulty setting.

In-Game Movies
Complete the game once under any difficulty setting.

A Secret Revealed
Complete Spartan mode.

The Fate of the Titan
Complete Spartan mode.

Secret Message 1
Complete Spartan mode.