You'll unlock this achievement at the end of Mission 18: Demon's Den. In this mission, Vergil asks Dante to boot up the four generators in Limbo, and then align then.
Each of the four rooms will be crowded with enemies once you start their generators, so be ready to strike. You can use the area to your advantage by pushing enemies off the sides, making them fall to their deaths.
Once all generators are up and running, Vergil will ask of you to align their four symbols with the ones on the four statues. Do this by slamming Eryx on the big red button on the floor, and you'll eventually get them all. The symbols will be outlined once you've put them in the right place.
You'll unlock this achievement after the puzzle is completed and the cut scene is done playing.