I’ve been playing halo 2 campaign on legendary and it won’t give me achievements I should have earned for completing the levels. Skulls, terminals, and toys are working just completing missions is not. Missing achievements so far: outskirts, metropolis, the arbiter, Oracle, delta halo, regret, and sacred icon. My gamertag is sparethread2457
Hey OP, there is a pinned thread for tracking achievement issues in the main MCC forums. Best to log any issues you are having there, thanks 