Forging Legend, Lone Wolf and Gravelord seem to be bugged. In my service record on the website and ingame it shows i have them completed but the achievment didnt pop and is stuck at 86%.
Are there any individual mission achievements that didn’t unlock whilst you did it as well? If so, the mission(s) did not register properly on the server side, and you’ll have to keep replaying them until their achievement(s) show, and then your overall achievement should unlock.
You may also be able to check it via your achievement tracker while you’re in game. It may still appear clear or incomplete. They may appear by themselves over time like they did on MCC as well. It’s a sucky bug, especially if you’re going for the hard achievements!