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Broke Back Precipice
Defeat the powerful foes within Broken Precipice.
Broke Back Precipice is a 10-point achievement earned by defeating three rare mobs — Bonebreaker, Pit Slayer, and Durg Spinecrusher — located at Broken Precipice.
Trigger the Daily Quest
The achievement requires the Assault on the Broken Precipice daily quest to be active. If it is not up, visit Sergeant Crowler outside your Town Hall in your garrison and purchase the missive for 
200 Garrison Resources to trigger the daily quest.
Kill Bonebreaker
Bonebreaker is a level 100 rare mob found at Broken Precipice. Killing him awards progress toward the achievement even without the garrison daily quest active. He respawns on approximately a 30-minute timer.
Kill Durg Spinecrusher
Durg Spinecrusher is a level 100 rare mob who patrols the western area of Broken Precipice. He respawns on approximately a 30-minute timer, independent of Bonebreaker's respawn.
Summon and Kill Pit Slayer
Pit Slayer can only be summoned while the daily quest is active. Head to the arena-styled area at the top of Broken Precipice and interact with the head on the pike to smash it. Pit Slayer will then appear in the arena pit at 38.80, 13.80.
Tips
See the video guide for a visual walkthrough of the Pit Slayer summoning mechanic and mob locations.