Hello Guys and Gals!
All you need to do is complete a race with all assists turned off and thank god its not for winning it!
Go to grand prix on the main menu (Solo)
Again, as the other comment suggests, Japan short is your best bet and i will show you why!
No qualifying, 3 laps, make sure all your assists are off!
Now, if your amazing at the game (Like i'm not) you can walk this.. Maybe if your an Esports king/Queen... OR, you can do the easy option, and wait for the AI to win and cross the line.
Although, you still have to actually cross the line and finish the race for the achievement to unlock!