All characters and levels
Press Triangle, Square, Circle, Triangle, Down, Right, Up, Left, L1(2), Right(2), Down, Up, R1, Circle, Left, Square(2), Down to unlock all characters and levels.

All default levels
Press Square(3), L1, Right, Down, Triangle, Up, Left, Circle, Square, Down, Up, R1, L1, Down(2) to unlock all default levels.

All bonus levels
Press Up(2), Down(2), Left, Right, Left, Right, Square, Circle, Triangle to unlock all bonus levels.

All race levels
Press Square, Triangle, Circle, Square, L1, Circle, R1, Triangle, L1, Circle, R1, Square to unlock all race levels.

All extras options
Press Left, Right, L1, R1, Down, Up, Right, Down, Circle(2), Triangle, Right, R1 to unlock all extras options.

Complete all current objectives
Press Circle(2), Square, Circle(2), Triangle, Circle(2), L1, R1.