For this you will need to finish in front of your teammate on every qualifying session of the season. Does not matter your starting position, as long as it is in from of your teammate. It is important that you do not change teams mid-season for this achievement. If you do you will need to wait for a new season and complete it all with the same team.
General rules stay the same if you are having problems:
1. Use THIS SITE for car set-ups that will make your life a lot easy.
2. Setting AI to "Amateur."