Possibly Story Related
You might get this by just completing each day, but to be safe make sure to serve the characters the correct drink. The reason for this is because certain characters don't show up in the Velvet Family Arc if you serve bad drinks and also there's a bad outcome. So to be safe:
1. Serve what the customer asks for.
2. Serve Gala the Gala Had tea/milk/ginger when hes a Werewolf.
3. Serve Hendry milk/milk/milk when Rachel ask you to.
This insures that Gala will be on the scene when the Velvet Family needs him to be. Also results in the happy ending arc.
I have the drink list on the Master Brewer guide.