Completed a flawless run on Crota this weekend and the achievement didn't show up. Everyone in my fire team got on, but I did not.
In case the link doesn't work, here is the game;
https://www.bungie.net/en/Legend/PGCR?instanceId=5406286643&characterId=2305843009294408346
I have a new Xbox One S Console, all info is saved on a portable drive.
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Took me a week for mine to show up. Hang in there. I wouldn't worry about it unless it doesn't show up by this weekend.