Here is the full list of all 9 A-Vroom achievements.
Win ten times with pig's car
win ten times with bear's car
Win ten times with dog's car
Win ten times with cat's car
win the pig ten times wiht any character
win the bear ten times wiht any character
win the dog ten times wiht any character
win the cat ten times wiht any character
Play 4-player with all ninja cat