Unlockables

Leaf Cup ... Achieve gold on Shell Cup and Banana Cup
Lightning Cup ... Achieve gold on Leaf Cup
Star Cup ... Achieve gold on Mushroom Cup and Flower Cup
Special Cup ... Achieve gold on Star Cup
More Kart Choices ... Achieve gold on all courses in 100cc, 150cc, or 150cc (mirror) Nitro Grand Prix
150cc Mirror ... Achieve gold on 150cc Retro Class (all courses)
Daisy & Dry Bones ...Achieve gold on all courses 50cc Nitro Grand Prix
Waluigi ... Achieve gold on all courses 100cc Nitro Grand Prix
ROB64 ... Achieve gold on all courses 150cc (mirror) Nitro Grand Prix
Final Mission ... Achieve one ranking on all courses for all missions one through six