Heroes of Loot

Occasionally when you exit a dungeon you will be dropped into a small, square room. These usually contain tons of coins but occasionally are just a trap filled with enemies. When you get one with enemies, this trophy will pop.

According to the developers, this is random, with the possibility of a room spawning every 5 levels.

https://steamcommunity.com/app/35928...8053434899639/

If you are not lucky enough to get this during the normal course of play, the best way to form it, it to replay over and over to level 6, and quitting if it didn't spawn. While it is still somewhat luck based, this seems to be the fastest way to force it.