Well, I know that the game is ALMOST 100% completed. I havent found all the cars. I've got some clothes, but not all. It has over 100 000 000$.

Some cheats that are useful:
BAGUVIX = Cant die (Exept because of explosions, drowning, helicopters or falls)
AEZAKMI = Never wanted
FULLCLIP = Unlimited ammo
UZUMYMW = Weapon kit 3
RIPAZHA = Flying car, get where you want FAST!

Yes, and and the first girlfriend you get is there no more. (cant remember her name)