This achievement is an easy one.
First thing you'll have to do is to go to single player> gamemode> Sprint race weekend.
To get the achievement in a fast and easy way, go to the settings of the race weekend and select the 2x5 minutes qualify and 2x10 minutes of race, and I recommend you to lower the AI ability to 80 and the agression to 70, also, don't forget to put 15 opponents on the track.
Once you are ready to go, set two fast qualifying times, no need to be the fastest that you can get, I recommend a 1.54.xx as a descent time, after that, go to the race and do the best you can, set a fast time on the track and win the race(be careful on the pitstops, it's mandatory, I suggest to stop almost in 4 minutes to the race finish) and after all the drivers crosses the finish line, at the end of the first race, the achievement will pop.
Good luck out there and stay safe