Specific achievements not unlocking? (PC, Steam)

Games Halo: The Master Chief Collection
1

So, I have an issue where some achievements are not unlocking, whilst others are. I don’t know why this is, but it is quite frustrating. I am playing on Steam, I have verified game files, tried the all the fixes that has been suggested by the 343’s support article (link: https://support.halowaypoint.com/hc/en-us/articles/360037573011-Achievements-Progress-Issues ) and still nothing (Yes, I am playing with Easy Anti-Cheat enabled) . I don’t know what to do and it has stopped me trying to get more in case it’s a waste of time.
The achievements not unlocking are (I have tried multiple times to unlock these with no success):

  1. I’m Sorry, Dave
  2. Mind the Skill Gap
  3. What About Bob?
  4. Your Heresy Will Stay Your Feet
  5. Front Page News
  6. I Didn’t Train To Be A Pilot
  7. The Humble Beginnings of Wiljax Brantley
  8. Wake up Buttercup
  9. They’ve Always Been Faster
2

ever found a fix because I can’t get I didn’t train to be a pilot to unlock

3

I am having random achievements on the xbox not unlocking as well. Such as The Humble Beginnings of Wiljax Brantley or Witness a grizzled scene.

4

Same thing with me. I have some overlap with your list.
For me, it’s:

  • New Ways to Save a Buck - Mind the Skill Gap - Front Page News - Tank Beats Everything - Two Corpses in One GraveAnd probably some others.