Hi there,
I unlocked the Warden Triumph today however didn't unlock the xbox achievement for completing a triumph seal.
I've tried logging out, switch characters and restarting my Xbox but hasn't changed anything.
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The 'Seal the Deal' achievement only works with the original Forsaken seals, of which the only ones still available are Dredgen, Unbroken, Cursebreaker, Rivensbane.