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Defeat the Dastardlies
Defeat at least four bosses.
Defeat the Dastardlies is a 10-point achievement earned by defeating at least four bosses across a rotating weekly pool that expands over six weeks.
Defeat Week 1 Bosses
Four bosses are available in Week 1: Glubtok, Baron Silvermaine, Lord Walden, and Watchkeeper Gargolmar. Defeating all four satisfies the minimum requirement of four bosses needed to complete the achievement.
Track Weekly Boss Additions
Each subsequent week adds one new boss to the pool — Hydromancer Thespia in Week 2, Mekgineer Steamrigger and Rattlegore in Week 3, Foe Reaper 5000 in Week 4, Chrono-Lord Epoch in Week 5, and Broggok in Week 6, bringing the total to 10 bosses over six weeks.
Tips
Since four bosses are available on Week 1, the achievement can be completed without waiting for additional weekly resets by defeating all four Week 1 bosses.