Pause the game and press Triangle, Square, L1, Circle, R1, X, R1, Square. If you entered the code correctly, you will hear a sound. All challenges except for 43 (Race The Chief), 48 (Bomb #5), 49 (Alien Half Pipe), and 50 (Storm HQ) will be completed. You will also have all Bomb Pieces, with the exception of #5.