Successfully complete the 'Talk to the Archbishop' mission and insert a controller into port 4 and press 'Start'. Then hightlight 'Options' and click and hold the Left stick and press A. Some of the following codes will have to be reactivated upon loading a different area.

Unlock Infinite Health, Energy, Weapons, Ammo and Boost for Ship:
God Mode

Completes ALL Current Crazy Bets and unlocks next Super Crazy Bet:
Complete Crazy Deal

Reduce Alarm Level when out of sight:
Easy Alarm

Enemies will not fire upon you:
Dumb Enemies:

Unlock $1 Million Scraps:
One Million

Get 50 Lives:
50 Lifes