Tibia Fandom states to get Verminbane: "Obtainable by completing 100 easy Prey Hunting Tasks." I can confirm I have this achievement and it's quite easy to obtain.
Sources:
https://www.tibia.com/forum/?action=thread&threadid=3506217&pagenumber=520
https://tibia.fandom.com/wiki/Verminbane
Probably related to completing Prey Hunting Tasks. [ source https://tibia.fandom.com/wiki]. Nothing more about this.
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