There are many special achievements in "Silent Luck", and extreme luxury is one of them. If you want to achieve this achievement, you only need to prepare a special cocktail made by Pony Express at Corey's birthday party. This cocktail It's still relatively easy to prepare, just pay attention.
How to achieve silence, misfortune and extravagant achievements
Extremely luxurious
Mixing Stagecoach Cocktails™ at Corey’s Birthday Party
6 days before the crash (Chapter 7)
Make cocktails at a birthday party
First use the machine to obtain crafting materials
Water: 3142
Tonic water: 1324
Sweetener: 2341
Place water and tonic water in the maker and pull the lever to get a boring soft drink
Put Boring Soft Drink and Sweetener in the maker, pull the lever to get a cocktail, and unlock the achievement