This is a missable achievement during chapter 2.
During the main storyline in Chapter 2, after you see the cutscene of the last remaining tenant of the building be bought out by Oda. After that scene plays out you'll ask a homeless man outside how Tachibana hires homeless associates to deface properties. After that, the man you're talking tells you to go to Public Park 3 to find more info. Once you arrive there 5 homeless people will be gathered around a barrel fire and they'll ask you to get a certain drink of their choice. Their choices are Beer (Malt's), Sweet Potato Shochu, Scotch Whisky, Sake and Champagne. What the achievement is asking for is for a ¥20,000 champagne for the person who wants champagne. (Note since certain achievements are bugged for some people make sure to make a new save game before you give the champagne to the homeless person just incase this happens to you.) You can obtain the gold champagne bottle from Don Quijote. Go there and buy the Champagne Gold for ¥20,000 and then hand it to him. Do not buy the regular champagne only buy the gold version. Once you give the homeless man his champagne the achievement should unlock.
Here's a guide for where to find the rest of the alcohol you'll need to continue the chapter.
Beer (Malt's): Poppo Tenkaichi St.
Sweet Potato Shochu: Poppo Tenkaichi St.
Scotch Whisky: Poppo Showa St.
Sake: M Store Kamurocho
Champagne: Don Quijote Kamurocho