Five Star Rating Achievement
Five Star Rating20
You have set clean lap times at 5 different circuits in Time Trial.
Time trial mode can be found in Proving Ground and then Time Trial, you pick a team then a driver which is your choice then a track and finish one clean lap meaning you must stay on the track and not cut corners or hit anything, as soon as you cross the line the time is registered and you can pause and quit to menu.
You need to do this for 5 of the 21 tracks.