I have already submitted a ticket regarding this and was told to submit a bug report here as well. The GMs told me it is most likely a bug.
For some time, I have had several achievements in game (such as paingiver II and executioner II) stuck at numbers like 11/25 and 12/25. Even after doing several dungeons where I placed in the highest damage and highest enemies killed, they remain stuck at the numbers listed above.
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