This is the hardest trophy in the game. To get it, you need 100% game completion. First of all, before attempting this trophy, you have to get all stars on the Tour (see  All Stars) and you also have to finish first in every Grand Prix on Expert difficulty (see  Welcome To Victory Lane).

You still won't be 100% after doing those things. To reach it, you have to beat most of the Ghosts (see  Yokozuna) and unlock most of the mods (Most likely nearly 100 out of 144 mods). The quickest way to level up and unlock mods is by completion Ring Races on Hard or Expert difficulty. Note that after reaching 99%, the counter will seem as though it is stuck, however it will eventually get to 100%. Think of this trophy as something like a minor platinum trophy for the game.