Being a completionist I worked untill I had each and every race in the Seeker championship with max points, so finish first with EVERY race. Finally made it, but the achievement is not unlocked! Playing on Xbox One. Name of the achievement : Seeker Elite Champion
There are more races which unlock once you complete the Forza Drivers Cup championship.
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My bad, you are right! Found a screenshot here : Screenshot
No, I did all within the Seeker championship. Contacted turn 10 already