I finished crota with 3 other ppl and only one person in the fireteam received the achievement what is going on it has been 3 days since the completion and still no achievements bungie fix your S.H.I.T or Atleast reply with an answer.
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Try signing out and back into your Xbox account. That usually works for when I run people for their achievement. When I recieved mine for soloing crota for the first time, it took 6 days before I got my achievement. You'll get it if one person did