Here is the full list of all 48 The Lost Art of Innkeeping achievements.
Because you said you didn't like pets, you received a very valuable item during the surprise party.
Someone outsmarted you to find the buried treasure first.
Pay off loan without raising prices beyond the 'Cheap' level.
Get the manor repaired for free.
Expose Rudolph's villainy and run him out of the village.
Sell paintings to Rudolph.
Pay off loan in classic mode.
Pay off loan.
Pay off loan without selling anything found during the course of the game.
Return 10 lost-and-found items to guests.
All four opera singers stayed at the inn on the same day.
Every possible guest stayed at least once (new game+).
Talk to the art expert and keep the six paintings owned by Aunt Agatha.
Find all 15 Dickens books.
Keep the gold sword and gold plate found in the ruins for display in the manor.
Willing to try new foods.
Fulfill all of the royal family's needs and receive the Royal Warrant.
Play host to the royal family.
An aquatic visitor and her pet stayed at the inn (new game+).
Play a prank on the prankster.
Receive a five-star rating.
Make a profit of 1,500 gold or more in a single day.
All five rooms at the inn are occupied.
Get Rudolph to give you the painting of roses hanging on his wall.
Solve the mystery of why Aunt Agatha had to borrow money, and discover Rudolph's deceit.
Obtain the painting of the couple.
All buildings in the village and the fountain have been upgraded, occupied, or built.
Lance and Gwen met and fell in love because of you!
The coral cave is open.
Achieve an average guest rating of 140 or higher with at least four rooms occupied.
Receive a gift from Irene (new game+).
Buy all upgrades for the manor from the general store and the tailor (new game+).
Pay off part of the loan and reach a profit-sharing agreement with the bank.
Reserve a room for a guest.
Give the gold sword and gold plate found in the ruins to the national museum.
Receive a four-star rating.
The ruins are open.
A guest stayed eight times before Day 30.
Receive a gift from Johan.
Chase off the ghost.
Receive a three-star rating.
Give the shopkeeper money to purchase supplies, with no strings attached.
You told Wodehouse you loved pets.
Receive a two-star rating.
Design an advertisement.
Receive a one-star rating.
Check in your first guest.
Get the maximum possible discount from the carpenter.