RAMPAGE: TOTAL DESTRUCTION UNLOCKABLES
Bubba
Unlock the other 29 monsters.
Eyegore
Finish the game with the "All Challenges Met" award for all cities.
Philbert
Finish the game with the "Par Scores Met" award for all cities.
Automatic monster unlocking
Allow the game to begin demo mode and have it auto-play. Any monsters unlocked by the CPU during demo mode will remain unlocked for your game.
unlock all monsters
Go to the main menu and press R and L. Then change the numbers to 141421. You will have all the monsters.