I'm in the same boat. I've been doing the ascendant challenges each week to find the one I am missing because my progress is stuck at 5 of 6.
I've done each one twice now, so something isn't clicking correctly.
The other potential option may be to do each "Time Trial" - perhaps that will clean up the system and trigger that 6th one to go?
Really want that achievement, but I definitely don't want to do Gambit or Crucible to get it.
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Apparently the time trial counts for a different triumph and it is bugged too, I've seen that people who completed the trial didn't get the regular triumph so I don't know. Also bungie said that they'll fix it in their next, this week in bungie patch notes, but that means we'll have to wait another six weeks.
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Yea, I knew it was different, but thought it might tell the game to take another look at the triumph criteria and retroactively unlock them.