MXGP - The Official Motocross Videogame

Before entering a race you are given a screen which reads Start Race, Race Options and Riding Assists which is where we want to go. Once in the Riding Assists menu you want to change the Physics to Pro which will turn off joint brakes and rider weight. Once confirmed start the race and finish it in full for it to count as a valid race. You don't have to finish first, you can finish dead last and still earn the achievement.