Pretty easy again, all you have to do is get pole, the fastest lap in the race and lead all the time.
Best works in a quick race mode.
And I mean all the time........if one AI overtakes you even for a second you are in trouble.
Hence no rolling starts as Pcars screws you there nearly every time, and a car might overtake you there for a bit.
So standing starts it is, once again I suggest an AI on your level or slightly below, as that is safer to race.
Can be done at the same time as the Gladiator Achievement.