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You must defeat the hidden boss within the Spellplague dungeon that is the Mimic King. To do this you have to locate the "Shifting Key" which is hidden in a Mimic Chest in the first section of the dungeon.
The Mimic Chest is right after the first bridge on the right side at coordinates: -432, 662. Once you kill the Mimic Chest, and someone picks up the key, you should see a prompt on screen saying "You found the Shifting Key" or something to that extent. It drops for someone randomly in the party, so look for the message on screen. The key will always drop from this Mimic chest! You can pull the Mimic Chest and complete Portal Dodger at the same time.
Upon jumping off the last cliff to the bottom level where Nostura, the final boss is; turn around and you should see the door for the Mimic King secret room. The entrance coordinates are: -2477, 1857. Open the door with the Shifting Key and head down the hall, clearing out two groups of mobs to reach the 'treasure room'. There are 4 mimic chests along with the Mimic King chest.
** Wait until all party members are in the room before you engage a chest! Otherwise the door will close and you could possibly lock a player out of the room leaving you at a disadvantage!
'Search' a chest and all the mimic's will come to life and try to eat your face. They hit very hard and could pose a problem for an unprepared group. Avoid their slam attacks as best you can! Upon the defeat of the Mimic king and his Mimic minions the achievement will pop!