The following codes should be inputted while you are
Up, Triangle, L3, Select, X, L2, Down, Square, Left, X, L1, Select.
Down, Square, Left, X, L1, Select.
Square, Circle, Triangle, Select, X, Left.
Weapon Set 1
Up, Down, Up, Up, Triangle, R1, Square
Weapon Set 2
Up, Up, Up, down, Square, Square, Triangle, Circle
200 Bones, 3 Flash, and Cans
R1, R2, L1, X, Down, L1
Complete current mission
Down, Square, X, Select, R1, Left
L1, Select, Square, Down, L2, Right.
Up, Select, X, Triangle, Triangle, Square
Down, Down, Select, Up, Up, L3 (that's pushing the left analog stick in, by the way)
Square, R2, Down, Down L1, L1
R2, Circle, Select, Up, L1, Right.
L1, X, R1, R1 Select, R2.
After a mission in Free Roam mode break into a jewelry store and take the cash register. Go towards your base, and then go up the first set of stairs and stop. Turn towards the stairs leading farther Up. While in this position, throw the register against the stairs until it breaks and then collect the money. If you do this right, you can do it until you get $999.