If I'm not mistaken, the Ascendant Champion triumph requires you to complete each unique Ascendant Challenges at least once. It's not counting how many times you have completed an Ascendant Challenge.
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That is correct. So I should have received it the first six weeks I completed the challenges, yet I still have not, even though I have done three rotations in case I missed a unique one. I have definitely done all of them and still no triumph.