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Go to raceday and play portland *far right and to the bottom play it in solo. Use a zonda or some other fast car. Finish raceday now check leaderboards for weekly and fliter to everyone. Now just keep racing till you get in top 100 not hard first try i ended up in place 104 then rank 34. Once you get your rank go back to same race day in solo mode and race 1 race with the same car. achievement will pop.