You have to play online to get that achievement. I find it best to use a fast bike, get it up to speed, push forward on the left analogstick and LT button (Left Trigger). Ride in the middle of the road so you don’t hit the sides. Get 100 Kudos and the Endo King achievement is yours to keep.
If you go to the forums on Xbox.com, you will find a list of all the achievements and tips to how to get it.
For statistics on PGR4, go to PGRnations.com.