Custom corvette mode
Be the victor in all of the C3 career mode races.

Route 66 Challenge
Be the victor in all of the C5 career mode races.

Every car and course
Go to the options menu, then go to "Change Name", and input XOPENSEZ.

Hints & Tips

Never lose a race
When you are losing a race or getting into to a wreck, just press Start. Then select "Restart Race" and the race will start again, and not count against you.

Get cops off your tail
When a cop starts to chase you, try to speed as much as possible or take a shortcut. With the 1978 Corvette 25th Anniversary, the cops will catch up with you -- try your best to get away from. Note: this will only work when you race one on one.