This isn't being acknowledged on MCC support...

So, I recently just finished Halo 3 on Legendary as it was my last Halo to complete on Legendary on the MCC. I then checked my achievement list and noticed I was missing achievements for Halo CE and 2. These achievements which were missing are Keyes and The Maw completion and Sacred Icon through to The Great Journey, even though the game says I have completed all the missions for every game, Halo CE through to 4. I then checked waypoint and noticed it said that I haven’t completeled the levels which I’m missing from my achievements. I then replayed all those missions and it didn’t record to waypoint. I then did them again and it still did not record to waypoint. I would like to know why my completions aren’t being recorded and I haven’t received the Helioskrill armour set.
Thank you for taking your time to read this. The reason I’m reposting this to the Halo 5 forum is as it seems that 343 don’t check the MCC support forums anymore

EDIT : I went through hell once again and I now have the armour and achievement

Did you equip any 0.0x modifier skulls when playing? I’ve heard that can affect achievement unlocking.

I too had a few levels when playing MCC that didn’t seem to count the first time I played them. Playing through those levels again always fixed the issue, though.

> 2533274817408735;2:
> Did you equip any 0.0x modifier skulls when playing? I’ve heard that can affect achievement unlocking.
>
> I too had a few levels when playing MCC that didn’t seem to count the first time I played them. Playing through those levels again always fixed the issue, though.

I went through Halo 2 with Scarab and Bandana on as I had finished it on Legendary on PC a while back and I didn’t want to go through hell again, but the first 7 missions were recorded as complete on waypoint so I don’t know why it would’ve have stopped. Same deal with Halo CE, although I was playing it with a friend and had no skulls on and we completed it on Legendary

> 2533274865687905;3:
> > 2533274817408735;2:
> > Did you equip any 0.0x modifier skulls when playing? I’ve heard that can affect achievement unlocking.
> >
> > I too had a few levels when playing MCC that didn’t seem to count the first time I played them. Playing through those levels again always fixed the issue, though.
>
> I went through Halo 2 with Scarab and Bandana on as I had finished it on Legendary on PC a while back and I didn’t want to go through hell again, but the first 7 missions were recorded as complete on waypoint so I don’t know why it would’ve have stopped. Same deal with Halo CE, although I was playing it with a friend and had no skulls on and we completed it on Legendary

Those skulls prevent some achievements from popping. You might have to do it without them if you want it to ‘count.’

I completed Halo 2 with Scarab and Bandana on and got all the completion achievements on legendary. The 0.0x skull multiplier only affects the par score achievements, from my own experience.

> 2533274880633045;4:
> > 2533274865687905;3:
> > > 2533274817408735;2:
> > > Did you equip any 0.0x modifier skulls when playing? I’ve heard that can affect achievement unlocking.
> > >
> > > I too had a few levels when playing MCC that didn’t seem to count the first time I played them. Playing through those levels again always fixed the issue, though.
> >
> > I went through Halo 2 with Scarab and Bandana on as I had finished it on Legendary on PC a while back and I didn’t want to go through hell again, but the first 7 missions were recorded as complete on waypoint so I don’t know why it would’ve have stopped. Same deal with Halo CE, although I was playing it with a friend and had no skulls on and we completed it on Legendary
>
> Those skulls prevent some achievements from popping. You might have to do it without them if you want it to ‘count.’

The game states that those skulls should only prevent par score and time achievements from popping, not level completion achievements. I got up to Sacred Icon and that’s where the achievements stopped popping

> 2533274865687905;6:
> > 2533274880633045;4:
> > > 2533274865687905;3:
> > > > 2533274817408735;2:
> > > > Did you equip any 0.0x modifier skulls when playing? I’ve heard that can affect achievement unlocking.
> > > >
> > > > I too had a few levels when playing MCC that didn’t seem to count the first time I played them. Playing through those levels again always fixed the issue, though.
> > >
> > > I went through Halo 2 with Scarab and Bandana on as I had finished it on Legendary on PC a while back and I didn’t want to go through hell again, but the first 7 missions were recorded as complete on waypoint so I don’t know why it would’ve have stopped. Same deal with Halo CE, although I was playing it with a friend and had no skulls on and we completed it on Legendary
> >
> > Those skulls prevent some achievements from popping. You might have to do it without them if you want it to ‘count.’
>
> The game states that those skulls should only prevent par score and time achievements from popping, not level completion achievements. I got up to Sacred Icon and that’s where the achievements stopped popping

Well, judging from the edited OP; you figured it out. I’m glad things worked out for you.