THQ has given us this amazing Unlock Everything Cheat Code. Just enter these Cheat Codes in the Main Menu Screen:
For the 360:
Left, Y, Down, Left, Y, X, Left, X, Y, Down, Right, X, Left, Up, X, Right
For the PS3:
Left, triangle, down, left, triangle, square, left, square, triangle, down, right, square, left, up, square, right.
Now you don’t have to unlock everything each manually. Just play the gameaaa!