Test Drive Unlimited Solar Crown

After reaching level 45, you will unlock elite upgrades in the game. Except gearboxes and Springs suspensions parts who hasnt legendary upgrades, you will have to spend on all others legendary upgrades of your car to make the acheievement pop.

PS : Electric cars have also their variants of legendary parts, like on the Porsche Taycan S Cross Turismo or Lotus Evora, but count as well