Coming Back for More: Achievement STEAM of Wolfenstein 2: The New Colossus

First, you must decipher all enigmas.
See Where to Find Enigma Machine & How to decipher Enigmas.
Now you can interact with the console next to the enigma machine to travel to the locations you've unlocked. decipher all enigmas and hunt down the Übercommanders in all districts to unlock this.
Upon deciphering the first enigma and traveling to the first district you also unlock the trophies 'Sightseeing' and 'Puzzler'.