I am having some achievement issues. The first 4 levels of halo ce are completed and shown as completed in game, but I never got the achievement in steam. Same with the first halo 2 campaign level, and every halo 3 level achievement. I have no issues currently getting other attachments not related to these mentioned ones, at least as far as I have noticed .My hosts file is not the issue. Or at least should not be. I sorted that out shorty after MCC PC launched.
Edit: I beat Cairo station again and got the missing halo 2 achievements. Looks like I need to replay the first four halo ce levels and all of halo 3 to get the achievements for things I already did. Irritating.