Still waiting for a fix from bungie, its my last achievement so hope it gets fixed.
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I also have the same issue with my PS4 account. I have all eight Iron Lord Artifacts attuned on all three of my characters. I still have the same characters that I had before Rise of Iron came out. You could say I "retried earning the achievement" two times since this trophy only required one character, and I've done all three now. Bungie's "troubleshooting" page on this matter is not helpful.