Cheat mode= unlock any cheat and the cheat mode option will turn up on the options screen
invulnerability= complete every grand prix championships with gold medals to unlock the unvulnerabilityoption at the cheat mode menu
runaway= complete crash mode with all gold medals on all 15 tracks to unlock the runaway option at the cheat mode menu
face off= win every face off in the first championships
custom compact car= win the custom series qualifier