I think several of my achievements on Xbox One are bugged. I've decrypted dozens upon dozens of engrams, but don't have the achievement to decrypt 25. I also have an exotic weapon equipped, yet haven't gotten the achievement. Are these known problems, and are they going to be fixed anytime soon?
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This is happening to lots of people. Only fix as of now is when in game go to settings and hover over the log out button and then chose switch profile(This wont sign you out of xbox live, it will only sign your profile off the game). This will put you back at the main menu. Then chose your character and your achievements will unlock as your character is loading up.