My group did Flawless Raider for the first time yesterday. Half the group got the achievement, the other half did not. I just unlocked another Destiny achievement just now after completing the requirements for it, but still no Flawless Raider. Is this a common problem? Is patience a virtue on this one, and it'll pop up some time in the next month or whatever?

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Logged in and out. Restarted Xbox regularly. Hard reset. Let it sit over night turned off, turned on today, still nothing.

:)

Also, because I want it I want it I want it. :(

Sign into Destiny, choose a character. Once you're in orbit, go to your menu like you're going to switch characters, but instead of switching, choose the sign out option. You should stay in Destiny but sign out of your Xbox live account. Sign back in and then the achievement should pop.

That worked for me and several of my friends.

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Xbox One achievements, especially in Destiny, have always been borked. Sometimes switching characters will get it to pop, sometimes logging out and back in will, and sometimes you just have to wait until it decides to give it to you. ):

It took about 6 months for mine to show up. I actually just had "Strength of the Pack" randomly pop a few days ago after I reset my Xbox, which was hilariously the last achievement I needed.

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That absolutely worked! Thanks a ton dude! :D