Halo 5 Achievements not unlocking...

So I completed the entire Halo 5: Guardians Campaign on Legendary difficulty but I didn’t get the achievements for it. This happened with a CTF achievement too. On the achievement app it says 100% completed for them, But there is also the locked symbol next to it. I tried replaying missions and doing the hard reset but nothing will work. Please help!
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what happened to me was similar bro. i have been doing the campaign SLASO and up to my last mission i have been getting a special emblem next to each mission in
my campaign stats.
i did Battle of Sunaion and finished it on legendary with all skulls on and not only did not get my special emblem but it did not even register that i completed the level. so i did it again and the same result or lack of result. it has said i completed the mission 27 times since before i did it the last 2 times.
i am beyond frustrated and disappointed. probably as frustrated as you

Anyone have a solution to this???

Wow, no one seems to care. I also have done several Campaign achievements and they aren’t unlocking. The hell, Bungie?

The same thing happened to me. I just finished halo 5 on legendary difficulty. Once I finished the campaign I was waiting to see the achievement notification but it did not pop up. When I went to the game hub it showed that only 86% had been completed and yet my service record shows that every mission has been completed on legendary. I have tried to restart my Xbox as well the game but it did not work. I really hope 343 reads this and solves the issue.

KidDarkness74 please don’t revive old threads.

Happy Halodays!