Disco Inferno

Kill all enemies without leaving the dance floor in the city outskirts

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On Act 2, Chapter 1, there is a large bar with a stage where you will fight a certain boss, after you will fight around 5 more enemies. You will want to fight them there, without stepping foot off the stage. Make sure you don't go too far down the stairs, as the achievement will not unlock.

If you step off the stage, too far down the steps, or the achievement doesn't unlock, simply reload the checkpoint.