Just hit Omega Tier 5 today, have the MACO, Omega and Adapted MACO Mk XII sets. I got the MACO and Omega XII sets before season 7 along with the appropriate costume unlocks. I think I completed all optional objectives before season 7, not completely sure about that but I do have the accolade now. I'm missing the MACO Elite Operative and Omega Force Shadow Operative accolades even though I have completed all requirements for both so I don't have either costume project available.
Have the same problem as stated in 1) but with MACO MKXII. I got the Armor before S7, in season 7 there 2 accolades M.A.C.O. Commando and MACO Commando. I brought the Shield and Weapon and MACO Commando (the version which gaves title) complets. M.A.C.O. Commando (title + trailor) is still in progress. It looks like the Image in 1).
Edit: The Accolade Omega Force Shadow Operative is not completed, too. The only Omega Accolade in progress is Vorn Distinguished Service Medal.