I just completed Crota on normal with 3 other friends and we fulfilled the achievement. The strange part is only 1 of us got it, and the other 3 didn't. I have proof it was done and I'd like to know how, if possible, I can get it to register for me without having to do it all over again.
English
#Help
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I tried a few different things and hasn't popped up, I'll hope for it to show up soon.