Need help achievement progress is stuck

so if anyone can i need help i had my play threw on legendary going and my little bro came in switched it to easy now my achievement progress is stuck at 94% do i have to re do the whole campaign or can i just play up to that mission? please help

Unfortunately that game save is lost. As you can change difficulty in-game, the achievement will track the lowest difficulty you use even if you change it back. That save will now track progress on Easy for the achievement now.

You will need to start again on Legendary.

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Oh man, that sucks. I feel you. Same thing happened to me, but at 29% and LASO! I debating if it’s worth redoing or just letting it go…