Successfully complete the indicated task to unlock the corresponding costume:
- Oliver Coipel's Thor: In Vanaheim (The Arrival), go through the first door, and stay on the overhang. Walk behind the tower with the door to find the costume icon.
- Destroyer Thor: Successfully complete the game.
- Jack Kirby's Thor: In Niflheim (The Approach), throw the statue head, then look to the right of one of the giant stairs to find the costume icon.
- Ultimate Avengers' Thor: In Midgard (Burning Town), search the area where you saved the trapped civilians from fire outside the police station to find the costume icon.
Successfully complete the game to unlock the Ragnarok! difficulty.