To unlock Hardcore Realism Mode, earn a 100 point rating on any track. The Harcore Realism will only be unlocked for the track you earned the rating on.
Unlock Richard Petty
Complete all of the Heat Challenges and earn at least a Bronze rating on each to unlock the legendary Richard Petty.
Arcade-Style Beat the Heat Mode
At the Main Menu, press Up, Down, Left, Right, R1, Left, Right.
Shoot Paintballs
At the Race Day screen in Singe or Head-to-Head, press Up, Down, Left, Right, R1, Up, Up. Use horn.
Remove Replay Text
At the Main Menu, press Up, Down, Left, Right, R1, Down, Up. During a replay, press Circle.