Achievement
Dungeon Heist
Dungeon Heist is a Terraria achievement. 
Golden Key counts toward it.
Description
Steal a key from the dungeon's undead denizens, and unlock one of their precious golden chests.
What counts
Pick up all of these:
Achievement
Dungeon Heist is a Terraria achievement. Golden Key counts toward it.
Steal a key from the dungeon's undead denizens, and unlock one of their precious golden chests.
Pick up all of these: