This achievement will unlock after winning a Horizon Rally. This consists of four stages. Your time for each stage is added up and compared to other racers. If your final time is faster than all of your opponents, you will win.
Note that you do not need to win every stage to win the rally!
The first opportunity to win this is in the Beaumont rally. Feel free to turn the difficulty down, and the assists up if you are having trouble, as Rally driving is very different from the racing you will have got used to from the main game.
Please either comment below or send me a Personal Message if you have any comments or improvements.