make a class A car for sprint racing. go into a sprint race. only start the race if you are playing against 1-3 other people and nobody is a class A car, you preferably want C/D class cars.
if you are having problems with people backing out because they don't have a class A car like you then get a class D car and when there is 15 seconds before start time change classes real quick.
you will get the wins if the other player quits.
--this solution is for those that aren't amazing at this game and don't have a friend to play with.
--i just picked up this game again today and am not very good but i used this strategy while going for this achievement and had it within 40 minutes no problem.