Use the following passcodes to enable the desired effect:
Unlock all missions: at the mission select screen, press L1, R1, L2, R2, Right, Square, L3, R3
Unlock all characters: at the main title screen, press L1, R2, L2, R1, Right, Left, L3, R3
Unlock all mission layouts: at the mission select screen and press R3, L3, R2, L2, R1, L1