Halo 3 ODST Achievement Help.

Games Halo: The Master Chief Collection
1

So While Halfway through Halo 3 ODST Expansion for MCC My game reset its save from mission 5 to mission 2, So I went and started a new game from the last mission I did on legendary. When I completed all missions on Legendary I did not get any achievement. Anybody have help?

2

alot of people are having issues with achievements not unlocking just give them time they will sort it out soon

3

So ya think i’ll have to redo It again?

4

no they will give everyone a patch update and it will unlock once you sign back onto the game i hope but you got to wait for the patch

5

Anybody need help with this?