I have all 8 artifacts done and the fires lit. But still no achievement. It's been a week already and I have done every methood. Bungie please fix this.
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I'm having this issue too. It isn't the Xbox. It's not sitting in a "Done... Unlocking" state. It's simply locked. I got all the in-game rewards for having the 8 artifacts. I simply haven't been able to get it to pop.