Tiny Tina's Wonderlands

The Chaos Chamber unlocks once you reach the final part of the Epilogue and are granted access to Queen Butt Stallion's castle. Once there, the Dragon Lord will give you an explanation of what the Chaos Chamber is and offer you a tutorial which is strongly recommended you take, but do note it doesn't count towards the trophy. To get the trophy to pop, you have to speak to the Dragon Lord after completing the tutorial, then changing the Chamber type to "Chaos Trial" by pressing either or , then pressing to confirm your choice. See Controlled Chaos for more details on what to expect from the Chaos Chamber.

Once you have successfully cleared your first run and collected your rewards, walkthrough the area transition portal in front of you then the trophy will pop.