Thor: God of Thunder Cheats

Alternate costumes for Thor
The following alternate costumes for Thor are unlocked either by locating a costume icon in-game or by beating a mode. Once unlocked, you can select a costume from the profile screen.

Coipel Thor (costume designed by Oliver Coipel): Vanaheim (The Arrival); after charging the first door and going through it stay on the overhang and walk behind the tower with the door
Destroyer Thor (Destroyer wearing Thor's cape and holding Mjolnir): Beat the game at any difficulty (tested on normal)
Kirby Thor (costume designed by Jack Kirby): Niflheim (The Approach); after throwing the statue head, it's to the right of one of the giant stairs
Ultimate Thor (Ultimate Avengers costume): Midgard (Burning Town); in the same area where you saved the trapped civilians from fire outside the police station

Difficulty
Ragnarok! Difficulty: Finish the game once with any difficulty.