I never cared about "achievements" or "trophies" when playing these games, personally.

I was just stoked to be playing a game that celebrates the amazing sport my heroes at Le Mans, Indy, Daytona, etc. get to compete in for real and drive all sorts of cars with different drivetrains, designs, etc.

I always preferred to play the game at my own pace on my terms. Bragging rights like those just weren't for me.