Here is the full list of all 23 Rusty Lake Hotel achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Mrs. Pigeon - 4
Mr. Deer - 4
Mr. Owl - 3
Mr. Owl - 2
Mr. Owl - 1
Mr. Boar - 1
Mr. Boar - 4
Mr. Boar - 3
Mr. Boar - 2
Ms. Pheasant - 1
Ms. Pheasant - 3
Ms. Pheasant - 4
Mrs. Pigeon - 3
Ms. Pheasant - 2
Mrs. Pigeon - 1
Mr. Rabbit - 3
Mrs. Pigeon - 2
Mr. Rabbit - 1
Mr. Rabbit - 4
Mr. Rabbit - 2
Mr. Deer - 1
Mr. Deer - 3
Mr. Deer - 2