Find the indicated numbers of hidden Rockstar barrels (collectables) to unlock the corresponding cheat option. Note: Enabling a cheat will stop your progress in Career mode and disable the earning of money and reputation from races.
Successfully complete Career mode.
Get the "Idol" rank (33,500 Reputation) to unlock the Karol Garage partner mission.
To unlock hydraulics and air bags, you must join the Rockstar Social Club, link to your Gamertag, then complete four of the twelve "Driving Test" achievements listed on the website. Doing so will unlock hydraulics/air bags for your Gamertag, even if you completely restart the game. If you already have four of the achievements completed, just joining the Rockstar Social Club and linking your Gamertag will unlock the hydraulics and air bags.
Reach the indicated rank to unlock the corresponding vehicle group:
Reach the indicated rank to unlock the corresponding performance upgrade:
Participate in the indicated number of races for a specific vehicle class to unlock the corresponding item that can be customized for that particular class (Tuners, Muscles, Luxury, Exotics, or Superbikes):
Use the following trick to get free parts without completing the game. Go to "Garage", and select "Customize Your Car". Go to "Performance Parts", and press X to auto upgrade. This will check off all parts you can put on. Do not press A. After you press X, press Xbox 360 Guide. Go to your friends list, and join someone's session. Note: You can also go to the recent players list for a better chance of finding someone playing online. When asked if you want to start a multiplayer match, select "OK". When you get on the street, you will have the parts installed with no money deducted from your bank. This also works on any interior or exterior part, but the process is slightly longer to make the car you want. For example, highlight "Front Bumper", then press X. Go to the bumper you want, and press Xbox 360 Guide. Join someone's game, and when you roll out of the garage, you will have that bumper. Quit the multiplayer game, return to the garage, and get any other part desired by doing the same thing.
Go to Arcade mode, and set the AI to "Easy", traffic to "None", and disable power-ups. To earn money, make sure you do not finish in last place.
Use the following trick to get rid of the police when doing a race. Finish the race, and enable the "No Police" cheat, then turn it off again. The police will disappear, and it will not have any effect on what you do afterward.
When you see a red target far away on the map, enable the "No Damage" and "Unlimited Nitro" cheats to reach them quickly. Then, turn off both cheats once you are about to race him to keep your reputation and money intact.
In both offline and online game modes, you can teleport around the map by entering the race editor, switching out of "drive and drop" mode, moving the pointer to where you want to go, then going back to "drive and drop" mode, and exiting the creator. You will be where you ended the race editor.
Accomplish the indicated achievement to get the corresponding number of Gamerscore points:
The following achievements require the "South Central" bonus downloadable content: