Unlockable: Credits
Beat the game on any difficulty.

Unlockable: Deleted Levels
Beat the game on any difficulty.

Unlockable: Heroic Possibilities
Beat the game on any difficulty.

Unlockable: Monsters of Myth
Beat the game on any difficulty.

Unlockable: God Mode (difficulty)
Beat the game on any difficulty.

Unlockable: Challenge of the Gods
Beat the game on any difficulty.

Unlockable: A Secret Revealed
Beat the game on God Mode difficulty.

Unlockable: The Fate of the Titans
Beat the game on God Mode difficulty.

Unlockable: In-Game Movies
Beat the game on any difficulty.

Unlockable: Character Graveyard
Beat the game on any difficulty.

Unlockable: The Birth of the Beast
Beat the game on any difficulty.

Unlockable: Visions of Ancient Greece
Beat the game on any difficulty.

Unlockable: Additional Costumes
After beating God of War's Challenge of the Gods, you'll unlock five new costumes for Kratos. Apart from just looking different, Kratos actually has different attributes for his damage power and defense power, and will also collect different levels of health, magic, and red experience orbs.