Probably related to completing Prey Hunting Tasks. [ source https://tibia.fandom.com/wiki]. Nothing more about this.
Just wanted to let you know I've been doing hunting tasks every day and I haven't achieved it yet but here's some updates:
According to the Achievement Hunter thread on the official Tibia Forums:
Verminbane was confirmed to be obtained by completing 100 easy Prey Hunting Tasks.Therefore, Monsterhunter and Taskmaster might be for doing 100 medium and hard tasks, respectively.
Also Tibia Fandom now states to get Verminbane: "Obtainable by completing 100 easy Prey Hunting Tasks."
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