While you are at the Main Menu, press L2, R2, L2, R2, Square, Square, Circle, Circle.

Unlimited Handcuffs

While you are at the Main Menu, press Square, Circle, Square, Circle, L2, R2, R2, L2.

Unlock All Power Moves and 120 Achievement Points

While you are at the Main Menu, press L1, L1, R2, R2, L2, R2, L1, R2.

Unlock Unlimited Batarangs

While you are at the Main Menu, press Circle, Square, Circle, Square, L1, R1, L2, R2.