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[Locked] Progress&Achievement not unlocking

OP A Sad Smoll

EDIT: solved
Try redoing Forerunner. Looked at your campaign history and while it says completed its the only mission that doesn't have a score so that mission didn't record correctly. Try redoing that 1 mission and seeing what happens.
I have also complete Halo 1 on Legendary and seeing a similar issue with achievements. Lower difficulty achievements are stuck at 95% completion. In other Halo games, lower difficulty achievements would unlock after completing the game on Legendary.
For any issues with achievements, please use the pinned thread in the main MCC forum. Thanks