You only need one controller for this.
From the main menu, choose Multiplayer, then Offline Multiplayer Choose a short stage like the Wales Rally GB - Alwen. Go to Car & Team and go down to Player 2 and hit
and choose whatever team you want and confirm twice. Now start the race.
You will start the first race as Player 1. Simply finish the race. Then the next time you race you will be Player 2 and be racing a ghost of Player 1. Again, just finish the race, doesn't matter if you beat the ghost. The achievement will pop after.