I think I’ve experienced a bug in MCC that I haven’t seen posted anywhere regarding playlists and achievements. I have completed the Halo 3 LASO playlist 3x and still no achievement will pop. On the main Halo 3 campaign screen (the screen after selecting H3 from the campaigns menu) it says I have 4/8 playlists completed, but when I’m looking through them individually, I have 5 completed.
LASO Campaign: 11/11
Wheels, Wheels, and More Wheels: 3/3
Easy Campaign: 11/11
Normal Campaign: 11/11
Legendary Campaign: 11/11
I have followed all advice I could find on the broken achievements subject but nothing has worked. I have also seen others with similar issues but it’s usually because after completing a playlist, they’re inexplicably missing a completed mission which can be fixed by painstakingly doing it again. In my case it says 11/11 on LASO, but I never got the “A Preference For Pain” achievement and completing it again didn’t do it either. There really has to be a way to fix this. I waited until after the September 22 2020 ODST update to post this just to see if anything would happen, but still nothing. I just want this achievement that I earned 3x already…