WoW Achievements — Browse All Achievements
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Door Buster
Unlock 150 doors within the Zskera Vaults using Zskera Vault Keys.
Door Buster requires you to unlock 150 doors inside the Zskera Vaults in the Forbidden Reach using 
Zskera Vault Keys, rewarding the title 'the Key Master' upon completion.
Acquire Zskera Vault Keys
Keys drop from killing rares and looting treasures in the Forbidden Reach. Since treasures are farmable, you can collect multiple keys per week, and because they are Bind-on-Account you can send them between your characters to accumulate them faster. As of patch 10.1.5, you can also purchase keys from the renown envoys at the main quest hub for 
50 Dragon Isles Supplies each, requiring 7,500 Dragon Isles Supplies total if starting from zero doors opened.
Open Doors in the Vault
The Zskera Vaults is a weekly area in the Forbidden Reach consisting of a large circular chamber with 4 floors, each containing 7–8 rooms. Use your keys to open doors on any floor; you do not need to loot or solve room puzzles to progress toward this achievement. Your progress is saved week to week, so any door you have already opened stays open.
Complete Over Multiple Resets
The number of doors you can open is capped each week at roughly 30, meaning starting from zero doors opened this achievement takes approximately 5 weekly resets to complete.
Tips
Send keys from alts to your main to maximize the number of doors you can open each week without farming on a single character.