In my mission lists I still have Khitomer Accords, which I never got around to doing before season five. Thus I never got my last piece of Borg set. So does this mean I can still play it as I of old? Problem I have with this is that I doubt anyone will be interested in doing it now that the STF versions are up.
Do the STF versions, if you do both ground and space, count for the borg set the first time you do them??
Did you get the accolade when you walked into the tunnel (I think it's Assimilated or Assimilation)? If you did then you should have received a hail to go to Battle Group Omega and speak to Four of Ten on the Victory, she'll then give you the Borg Sci BOff.
I had the same issue on the cure. You can complete the mission simply by playing through the appropriate ground/space part, but you cannot turn in the mission (as far as I know) since the STF's have been changed.