Enter these during play:
Change Bike Tire Size
CIRCLE, RIGHT, X, UP, RIGHT, X, L1, SQUARE

All Vehicles Chrome Plated
TRIANGLE, R1, L1, DOWN, DOWN, R1, R1, TRIANGLE

Black Cars
CIRCLE, CIRCLE, R1, TRIANGLE, TRIANGLE, L1, SQUARE, SQUARE

Cars Drive On Water
CIRCLE, X, DOWN, CIRCLE, X, UP, L1, L1

Bobble Head World
DOWN, DOWN, DOWN, CIRCLE, CIRCLE, X, L1, R1

Have People Follow You
DOWN, DOWN, DOWN, TRIANGLE, TRIANGLE, CIRCLE, L1, R1

Upside Down Gameplay
DOWN, DOWN, DOWN, X, X, SQUARE, R1, L1

Commit Suicide
L1, DOWN, LEFT, R1, X, CIRCLE, UP, TRIANGLE

Sunny Weather
L1, L1, CIRCLE, R1, R1, SQUARE, TRIANGLE, X

Faster Clock
L1, L1, LEFT, L1, L1, RIGHT, CIRCLE, X

Random Ped Outfit
L1, L1, LEFT, L1, L1, RIGHT, SQUARE, TRIANGLE

Spawn Rhino
L1, L1, LEFT, L1, L1, RIGHT, TRIANGLE, CIRCLE

Destroy All Cars
L1, L1, LEFT, L1, L1, RIGHT, X, SQUARE

Peds Riot
L1, L1, R1, L1, L1, R1, LEFT, SQUARE

Peds Attack You
L1, L1, R1, L1, L1, R1, UP, TRIANGLE

Never Wanted
L1, L1, TRIANGLE, R1, R1, X, SQUARE, CIRCLE

Full Armor (Blue Bar)
L1, R1, CIRCLE, L1, R1, X, L1, R1

Display Game Credits
L1, R1, L1, R1, UP, DOWN, L1, R1

Raise Wanted Level
L1, R1, SQUARE, L1, R1, TRIANGLE, L1, R1

Money Cheat ($250,000)
L1, R1, TRIANGLE, L1, R1, CIRCLE, L1, R1

Full Health (Red Bar)
L1, R1, X, L1, R1, SQUARE, L1, R1

Perfect Traction
L1, UP, LEFT, R1, TRIANGLE, CIRCLE, DOWN, X

Raise Media Attention
L1, UP, RIGHT, R1, TRIANGLE, SQUARE, DOWN, X

Faster Gameplay
R1, R1, L1, R1, R1, L1, DOWN, X

Peds Have Weapons
R1, R1, L1, R1, R1, L1, RIGHT, CIRCLE

Slower Gameplay
R1, TRIANGLE, X, R1, SQUARE, CIRCLE, LEFT, RIGHT

Aggressive Drivers
SQUARE, SQUARE, R1, X, X, L1, CIRCLE, CIRCLE

Spawn Trashmaster
TRIANGLE, CIRCLE, DOWN, TRIANGLE, CIRCLE, UP, L1, L1

All Green Lights
TRIANGLE, TRIANGLE, R1, SQUARE, SQUARE, L1, X, X

Upside Up
Triangle, Triangle, Triangle, Up, Up, Right, L, R

Weapon set 2
UP, CIRCLE, CIRCLE, DOWN, LEFT, CIRCLE, CIRCLE, RIGHT

Clear Weather
UP, DOWN, CIRCLE, UP, DOWN, SQUARE, L1, R1

Rainy Weather
UP, DOWN, SQUARE, UP, DOWN, CIRCLE, L1, R1

Foggy Weather
UP, DOWN, TRIANGLE, UP, DOWN, X, L1, R1

Overcast Weather
UP, DOWN, X, UP, DOWN, TRIANGLE, L1, R1

Weapon set 1
UP, SQUARE, SQUARE, DOWN, LEFT, SQUARE, SQUARE, RIGHT

Weapon set 3
UP, X, X, DOWN, LEFT, X, X, RIGHT

Calls closest Ped to come hop on/in your vehicle. X, Square, Down, X, Square, Up, R1, R1

White Cars
X, X, R1, CIRCLE, CIRCLE, L1, TRIANGLE, TRIANGLE

Upside Down Gameplay2
X, X, X, DOWN, DOWN, RIGHT, L1, R1