Unlock the following treasures by performing the corresponding tasks:

TREASURE - HOW TO UNLOCK
Challenge Of Hades - Complete the game on any difficulty.
Character Concept Art - Complete the game on any difficulty.
Environments Concept Art - Complete the Challenge Of Hades.
God Mode - Complete the game on any difficulty.
In-Game Movies - Complete the game on any difficulty.
Inside Ready at Dawn Studios - Complete the game on any difficulty.
Making Of Attica - Complete the game on the God difficulty.
Outtakes Concept Art - Complete the game on the God difficulty.
The Lost Levels - Complete the Challenge Of Hades.

Unlock the following costumes by performing the corresponding tasks:

COSTUME - HOW TO UNLOCK
Spud Of War costume - Complete the game on any difficulty. This costume increases your Magic skill.
Mime Of War costume - Complete the game on the God difficulty. This costume gives 10x Red Orbs and makes weapons invisible.
McKratos costume - Complete the Challenge Of Hades. This costume increases your Attack skill.