Start a Grand Prix and set the event to a short race weekend and the race distance to 1 lap, as well as A.I. difficulty to Amateur. Just to be sure, set rules and flags to reduced as well as setting the weather to "clear".Use driver assists in any way you wish.
Since you have set the Grand Prix to a short race weekend you will only have to drive in one qualifying session - with the A.I. set to Amateur, you shouldn't have any problems posting the fastest lap and getting pole position.
Finally, win the race to unlock the achievement.