Enter these codes in the Options - Cheats Menu:

 CHEATINGMUTHATRUCKER or ATJCEHJMJ - Enable all cheats except evil truck

 LOTSAMONEY   - Lots of money
 LAZYPLAYER   - Unlock all Missions
 USETHEFORCE   - Automatic
 SATNAV VICTORS  - Diplomatic immunity
 VARLEY   - Get Evil Truck
 DAISHI   - Small People everywhere!
 GINGERBEER   - Fast truck (hyperfast)
 PUBLICTRANSPORT  - Unlimited mission timer
 6WL    - No damage
 VICTORS                - Diplomatic Immunity

 Collected with the help of

 Gangsta33, Gangsta33@gmx.at