ODST Legendary achievements not unlocking

So my friend and I recently completed the Halo 3: ODST Legendary playlist on CO-OP. My friend got the achievements, I did not. I have the achievements for the individual missions and for completing a playlist in ODST. I did not get the achievement for completing the campaign on legendary though. In the menus it says that I have completed all of the missions on legendary co-op. However in the achievements app it says I only have 87% of the legendary campaign completed, yet the menus (and me knowing that I have done it) say I have completed the whole thing on legendary.

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> So my friend and I recently completed the Halo 3: ODST Legendary playlist on CO-OP. My friend got the achievements, I did not. I have the achievements for the individual missions and for completing a playlist in ODST. I did not get the achievement for completing the campaign on legendary though. In the menus it says that I have completed all of the missions on legendary co-op. However in the achievements app it says I only have 87% of the legendary campaign completed, yet the menus (and me knowing that I have done it) say I have completed the whole thing on legendary.

Pretty much the same issue, mate. I don’t know what’s up, I didn’t get a response on my post. Hopefully it’s addressed sooner than later.

https://account.xbox.com/en-us/gameclip/822cf498-0d4e-41e5-ac79-48263b9e1b76?gamerTag=Sergeant%20Novak&scid=77290100-225e-4768-9373-98164430a9f8

I’ve beat it twice now. Still nothing and it says 9/10 complete. Resume “epilogue” mission 2. Fix this. Open the playlists up.