- Boolean121
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- Exalted Member
I had a look at some other people with similar problems, and it seems it was just missing one level or something that wasnt complete on the level they were trying to unlock.
I had a look on my own, and sure enough I had missed a level on legendary, and once I did that, the achievement unlocked.
As for the Bungie.net profile, I think that only counts what you do solo, so for me it still hasn't updated my ODST to legendary, because I did coastal Highway with friends.