Achievements aren't working

Games Halo: The Master Chief Collection
#1

No achievements will unlock for me. I’ve played for 5 hours and have 0 achievements. Not even killing 100 enemies which I’ve done several times over.

#2

Read this post and see if any of it helps you. I had the same issue and it fixed it for me.

https://www.halowaypoint.com/en-us/forums/85d779d52cfd46918b4f8b638f2e3c7b/topics/several-achievements-not-unlocking/b3f908eb-d239-4285-9334-84e9b162c96a/posts?page=1#post14