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And Long May They Reign

Complete every single King of the Mountain Race.

And Long May They Reign0
3 guidesOnline/OfflineSingle PlayerCooperativeBuggy +Buggy -
23 0 0
This is pretty straight forward, complete all the races you see (doesn't need to be 3 stars but worth doing that anyway) and then when all of the races are complete start a Championship event and complete the first race of the Championship.

Once you complete the Championship race (if you left it to last like I did) then the Achievement should pop.

Like R3f1CuL, I also did King of the Mountain as soon as it became available so make sure you do that race too if you were keeping it till later.