Yeah probably so. Kinda sucks you getting stuck with those. I had gotten a lot of ones like that done before they changed it so I was auto given the achievements. But now most of mine aside from Firnfeld are 7+. While many are just 1 person being 7+ required, I am wondering if they even work properly. I've won multiple against 7+ and done it with full hull and not dying. Didn't record a single one.
Pretty much given up on those. Eventually Muse will probably change things again and then it will all be possible. Currently I believe only level 14 is possible in game. But it takes over 1000 matches + a bunch of other things and I think a few of the achievements are messed up in that too. Hard to tell on some because they are very situational. Best give up on 15. It'll probably be a year before 15 is actually possible. Even then, look for achievement farming threads to pop up before its doable in pugs. Heck I might just make some in clan events for farming the Firnfeld one for 4+ perfects. Just get 5 other pilots who don't care and get a few wins. Then contact Muse to get Flayed reinstated. No way in heck I'm going through the hell of getting Flayed done again.