I won't rant about how Ghost War in this game is not any fun at all, that's a given.
I would try to get better and play it if possible - The issue is PvP is so dead on PC I can barely find any matches. I'll be waiting 15+ minutes to get into a lobby with the risk of people leaving before the match starts anyway.
I can't actually unlock these items if I can't play Ghost War due to the lack of activity.
Fix: Add all Ghost War cosmetics to PvE challenges in Solo/Coop play.