To get this achievement, you need to give correct drinks to Lua and Baileys.
On the night of September 22, Lua will want a Dark Chocolate drink which is chocolate, chocolate, chocolate. Baileys will want a Cappuccino with Latte Art which is Coffee, Coffee, Milk, Draw Latte Art. (Just pour some milk and move it around)
Baileys will want a Green Tea Latte which is Green Tea, Milk, Milk.
On day 4 September 25th, Lua will want a Green Tea Latte.
On day 7 September 28th Baileys will want a Ginger Latte which is Coffee, Ginger, Milk.
On day 11 October 2 Baileys will want a Bitter Heart which is Chocolate, Ginger, Cinnamon.
Lua will want a Gingerbread Coffee which is Coffee, Ginger, Cinnamon.
Getting all these drinks correct should net you this achievement. It should pop after giving that last drink