Complete 10 Autocross events without hitting gate cones.
There are Autocross events in the Rivals mode, and there are exactly 10 events, just perfect them and you will get the achievement. Also, you will be knocking out a good chunk of "Born Competitor" this way. You can also replay any race as many times as you want. I find the quickest and easiest way is to use the Ferrari 360 Modena on the Laguna Seca track in Rivals mode.