How do you get all the characters in the incredible hulk game

Incredible Hulk: Generic (starting character); already unlocked.
Gray Hulk: Smash 250+ objects
Red Hulk: Xbox 360 exclusive; already unlocked
Green Scar: PS3 exclusive; finish the game?
Joe Fixit: Xbox 360 exclusive; finish the game?
Ironclad: Trick a U-Foe into killing of his/her teammates.
Abomination: Kill Abomination
Hulkbuster Iron Man: Have an Iron Man save file.
Maestro: Destroy a building in every district.
Classic Hulk: Collect 10 comic book covers.