This achivement is unmissable and will unlock when you do the second of 2 dungeons that require 40 wands to gain access and have a shard piece to collect to progress the storyline. These two dungeons will be on opposite sides of the map with the Ancient Robot (Which recommends level 24) being the one on the WEST.
Enemies in this dungeons will have Dark, sharp and light wards so bring powers accordingly.