At the beginning of every section of the WSR you are asked to pick some sponsors, each having unique objectives. As you progress, you will have more and more slots available for sponsors. Make sure to pick the easiest sponsors, as they all offer the same reward in terms of fans. As you complete each individual section of the WSR, you'll want to keep all these objectives in mind, and you can view them at any time by pressing in your garage. If you're able to complete all your sponsor objectives, you'll unlock this achievement during WSR Season 3, although there is a lot of room for error, and you should get the achievement even if you miss half of them.