Cars

Please note that this is the event actually named "Radiator Springs GP" from the garage type building where you picked up the high speed heist mission, not the similarly named 3 lap event across the way called "Radiator Springs Grand Prix" - this had me confused for a little while!

To unlock this achievement you must win the Radiator Springs GP race in the game. This is a two lap race that has you traverse through Radiator Springs.

This race will be unlocked in Chapter 4 once you finish the Smasherville Race.

I don't think any of the races are that hard to do but if you want to make things easier and faster I would suggest using the cheat codes (you will still get your achievements). I recommend only doing "VROOOOM" and "IMSPEED" since I am not sure if the others affect achievements and they will not help you at all. The cheat codes are found here:

http://vgstrategies.about.com/od/xbox360cheatsc/a/CarsC....htm