I activated all the artifacts on my hunter and didn't get the achievement. I bought them on different characters each week and just moved around on all characters to activate them. I'm making this post to help clear things up for me and help anyone getting this achievement in the future.
1. Did I need to buy and activate them on one character?
2. Does moving a token over from another character work?
3. Can I still buy them and unlock the achievement even after I activated them all on all characters?
4. Do I make a new character to fix my problem with them all activated?
If you have any solutions or feel like these options answer the problem please let me know.
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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.