This is a missable achievement in chapter 3.
This guide is from the guide I used on the ps4 version from psnprofiles.
After leaving The Grand in Chapter 3, your objective will be to head over to Odyssey, but before you do so, there are three NPC's scattered around Sotenbori you can talk to in order to gain information that will be useful for the negotiation with Yamagata. Check the map below for the locations of the NPC's; they've been numbered. They can be spoken to in any order. Here's a pic from psnprofiles
Note: It's recommended that you make a save before you enter the club because it's possible to mess up the next part.
After you've spoken to all three NPC's, enter Odyssey and continue on until you're seated at a table and given the chance to look around. Now you must look around the club and check everything you can such as the 2 tables that are filled, the empty one right next to them and the table right next to you. I don't know if looking at Mr. Libido dancing on the stairs dancing counts but look at him as well just to make sure. Once this is done, continue on with the story. You will receive this achievement when you enter The Grand near the beginning of Chapter 4.