Kinda nitpicking about my service record here. I clearly have the achievement, and have had it since 2009. Legendary was done co-op, but it shows normal. On the old waypoint it showed as being completed Legendary.
I saw in some similar posts to play a few games connected to xbl so i did. I played two multiplayer matches, one with the multiplayer disc that came with ODST, and one on the regular halo 3 disc. Should I replay a campaign mission or something? It’s been a few hours and nothing has changed. Also been 3 days since my original post… prob talking to myself…