Cars 2: The Video Game

I popped every achievement and didn't get this one, which had me wondering. So I went to 'Awards' and checked my crests and badges. It turns out I only had 8 perfect starts recorded, so it did not give me this one. What had happened was that I boosted my perfect starts achievement with a turbo controller and when I finished, instead of start>exit which prompts a save, I just shut my console off for the night..so the game didn't save them (even though the achievement unlocked) and I had to do them again. Once I did, this quickly popped.

Moral of the story: If you have every achievement and this one doesn't pop, just check your badges and crests...you're likely missing something because you didn't save (by using start>exit) after accomplishing it.