Finished Halo 5 on legendary, got no achievements?

So I’ve been grinding through the campaign of this game on legendary to receive the achievements “Forging a Legend” and “Lone Wolf” but after finishing the final mission, I didn’t receive either achievement. I saw some other people had some missions not recognize as completed but on both Halo 5 and Halo waypoint it says that all the mission are completed. Is this a common thing and is there a way for me to fix it without going through the game again? If it is just one mission i have to redo then I will be willing to do so.

<mark>mod edit: moved to Halo 5 Support</mark>