The following solution was taken from PowerPyx's trophy guide - full credit to PowerPyx.
This achievement is earned during the main quest The Demolished Woman on Byzantium. To get this side quest you must attempt to turn in Phineas to the board through Udom Bedford. After getting his seal back from Gladys he’ll get you to go to Byzantium to meet Sophia Akande, who will then give you this main quest to prove yourself to her.
Sophia asks you to “deal with” a cartographer named Rachel Lockwood. If you head to her office and break in, you can find out that she is hiding in the maintenance tunnels under Byzantium. Head down there and “deal with her” however you see fit which will unlock the achievement. You can then return to Sophia when you’re finished to complete the quest.