Here is the full list of all 8 Wacky Wheels HD achievements.
Completed the Mirror Gold Wheels grand prix!
Completed the Mirror Silver Wheels grand prix!
Completed the Mirror Platinum Wheels grand prix!
Completed the Silver Wheels grand prix!
Completed the Gold Wheels grand prix!
Completed the Platinum Wheels grand prix!
Completed the Mirror Bronze Wheels grand prix!
Completed the Bronze Wheels grand prix!