Before I go further, I am aware of checking the hosts file and clearing that if necessary. The issue is not with achievements unlocking, as I’m still getting those for collecting skulls, however the game is not recognising my progress through stages. I’ve been playing Halo 3 since it came out on PC, and several levels are marked as incomplete even though I have completed them. Now, I’m not sure if this is bugged because I’ve already completed them on Xbox, but the progress even on here still shows I’ve not finished this missions.
I’m playing online co op and my partner in play also isn’t getting the achievements for completing the levels (first time playing the game) but is getting the achievements for collecting the skulls. It’s really demotivating and there’s only so many times one can play a level back to back before you get sick of it.