As with my other solutions, i'm playing the game and writing these as i go along, with that said i got this achievement by going to radiator springs and doing the tractor stampede, the description says 'win every tractor stampede event', and i don't know if there are anymore but this opened up on my first.
You need to find 10 tractors and when close to them rev your engine to tip them over, i think about 3 of the tractors were driving around but the other 7 were static, so find those static ones then do laps around the town to find the others, job done.