WoW Achievements — Browse All Achievements
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Defeat the Dastardlies
Defeat all the Dastardly Bosses.
Defeat the Dastardlies requires you to defeat all Dastardly Bosses that appear across the Dastardly Duos event, which rotates different bosses each week and takes a minimum of 6 weekly resets to complete.
Understand the Weekly Rotation
Each week of the Dastardly Duos event introduces different bosses: Week 1 spawns Glubtok, Baron Silvermaine, Lord Walden, and Watchkeeper Gargolmar; Week 2 adds Hydromancer Thespia; Week 3 adds Mekgineer Steamrigger and Rattlegore; Week 4 adds Foe Reaper 5000; Week 5 adds Chrono-Lord Epoch; and Week 6 adds Broggok. The achievement cannot be completed in Week 1 alone.
Use the Bullhorn to Summon Bosses
Use the 
Bullhorn of Calling to summon the available bosses each week, then defeat each one to accumulate progress toward the achievement.
Wait for Broggok in Week 6
Broggok does not spawn until Week 6 of the event — using the Bullhorn of Calling in earlier weeks will not cause him to appear, so his defeat must wait until the sixth week of the rotation.
Tips
If the achievement shows no progress after defeating a boss, relog to force the tracker to update.