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This achievement can be earned during Mission 5, The Royal Conservatory.

After gaining access to the Conservatory, make your way to the right-hand side of the building; you will soon find yourself inside a large three-story, atrium-like room. For the purposes of this achievement, it would be best to eliminate all of the witches inside this room before interacting with the Oracular device on the second floor (the device is quite large and hard to miss). Once the witches have been dealt with, interact with the Oracular switch and listen to the voice that fills the room. Pull the lever a second time after the voice ceases, then a third after that. The achievement will unlock after listening to all three voices.

NOTE: This achievement must be done before obtaining and installing the new lens into the device, that is, assuming you are going the non-lethal route in dealing with Ashworth. Additionally, though not entirely necessary, this is best done during a lethal High Chaos playthrough since it's preferable to have the Witches in this room eliminated before interacting with the Oracular three times. If they are left alive when you go to interact with the machine, they will become alerted and they will attack you.