I'm not even 50 in a DoH/DoL yet, but even I can understand the frustration that OP is dealing with.

If you started levelling a DoH or DoL before achievements were introduced, you effectively have to go back and do one or (many) more achievements AGAIN as if you hadn't before, because you've likely already done them but they weren't accounted for when you did.

Very frustrating, grueling and extremely time consuming.