Unlock all characters and character levels: At the main menu, press Y, B, X, Y, Down, Right, Up, Left, L, L, Right, Right, Down, Up, R, X, Left, B, B, Down,
Unlock all objectives: In story mode, pause then press X, X, B, X, X, Y, X, X, L, R.
Unlock all bonus levels: At the main menu, press Up, Up, Down, Down, Left, Right, Left, Right, B, X, Y.
Unlock all levels: At the main menu, press B, B, B, L, Right, Down, Y, Up, Left, X, B, Down, Up, R, L, Down, Down.
