Alternate Paint Schemes:
Get 3 S ranks with a vehicle to unlock it's alternate paint job. Alternately, just win 10 races with a car.
Monster Truck:
Unlock all cars' paint schemes.
Mirror Race mode:
Get an S rank on every track in Super Excite mode.
Crazy Super Truck:
Get an "S" rank on all races in mirror mode to unlock "The Crazy Super Truck". Crazy Super Truck has unlimited nitro.
Crystal Road:
Unlock Super Excite Mode then get passing ranks in every race to unlock the Diamond Cup with the Crystal Road track.
Thanks to Revolution Readers Manzai and The_Broose!
| 
