NOTE: It is important that you are in Byron Bay, as the requirement for this achievement will be impossible to obtain in Blizzard Mountain or Hot Wheels Islands.
By playing the main singleplayer in Byron Bay, Anna will eventually tell you that there is a potential driver who would be perfect for your drivatar lineup. By pressing
, look for a large yellow circle on the map (it's pretty big, so you can't miss it). Once you have found it, either set a way point or fast travel anywhere in the circle, and drive within the circle until you come across a driver with a yellow target icon above their vehicle. Drive behind them and press
to challenge them to a race. You MUST win at this race in order for the achievement to count. Once you have won, a menu will pop up in which you can press
to hire the drivatar to your lineup. Note that your friend that you are hiring DOES NOT have to had even played FH3 at all and it will still count. Once you successfully hire the drivatar to your lineup, the achievement will unlock.