Here is a guide on how to get all achievement for Hotel Sowls game.
A Skeptic
How to: in the bar ask bartender to read you on the tarot cards. repeat untill you’ll get all 5 different cards.
A Novice Cook
How to: cook something on the kitchen: onions/ eggs/ spiders/ octopus.An Expert Cook
Special thank you to lizraldHow to: you have to cook all recipes (fried egg/boiled octopus/fried onion(edible)/another onion recipe(for letter) and you have to cook enough dishes to unlock it.
a) you can pick up only onions and cook them in the kitchen to get both An Expert Cook and One Day Farmer.
b) you can pick up both eggs and onions in the garden, cook them in the kitchen and repeat untill you get it.
Annoying Guest
How to: I got the achievement by spamming interactions with the security guard on the rooftop.
Archiving
How to: collect all A’s letters. most of them are pretty visible, the only one you can really miss located in the room 404, above poster with a spider.
Chemical Accident
How to: in the room 404 before you do story stuff add in the main cauldron anything out of the recipe. e.g. an onion. or use ingridients in the wrong order.
Click Me
Special thank you to 
End of the Darkness
Special thank you to PEPSSIHow to: on 4th floor in the room 402 after opening the door don’t take the stairs down, but go left instead untill you reach shiny stars.
Free Stay
Fury of an Egg
How to: step on the egg (2nd floor, left of the baker), don’t take it in the inventory. you have to walk over the crushed egg untill it gives a notification.
God of Dart
How to: have to hit in the middle circle on a dart board down in the bar.
Half-fish
Special thank you to Halloween
How to: after a few days of living in the hotel, visit the garden to find out that pumpkins now have spooky faces, click on any of them.
Little and Often Fills the Purse
Special thank you to 5727989How to: check in the hotel and gain 1000 coins by selling eggs or gambling on the vending machines. once in forever a while you will pick up the golden egg (doesn’t look different in the inventory) from a chicken and can sell it for 300 coins. vending machines sometimes can give you 300 coins as well.
Lucky Day
How to: gamble on the vending machine untill it gives away 300 coins.Nasty Customer
Special thank you to 5727989How to: don’t check in and go up to the 3rd floor. on the right you will find the Panda market clerk, don’t talk to him but click on the items he’s selling untill he starts getting annoyed with you. click untill achievement pops.
One Day Farmer
How to: pick up onions untill you get the achievement. collect an onion -> go to the kitchen and cook it -> go back for another onion (you don’t have to throw away cooked onions)
Prank Call
How to: click on the phone in your room or on the reception desk untill it gives you “phone is broken” message.
Quiz Crasher
Special thank you to lizraldHow to: when left rock asks you who is the owner of this room, pick up any options other than “IT” untill you get the achievement.
Relaxed
Special thank you to lizraldHow to: around the hotel you will find sofas (there is one in your room as well), sit and rest on any of them untill you get it.
Rollercoaster Tycoon & Slaughterer
if you will push all chickens into the pond, you will not be able to obtain eggs anymore !WARNING!
How to: push a chicken into the pond
How to: push all chickens into the pond
Rollercoaster Tycoon 2
How to: there are 3 ballons around the hotel: 3rd floor, 5th floor, the roof; you have to poke all of them to get it.
Talkative (more information?)
I would assume it’s given for completing all possible dialogues with staff.I also got it on the second playthrough which makes me assume it accumulates through all your new games untill you have all converastions
The Rich
Special thank you to Warmhearted
How to: on the 5th floor find a woman with 2 snakes. she will ask you to help her and to find her black snake. go with one of her snakes down to the bar where you can find the missing snake. return the snake to its owner.
Wasting
How to: around the hotel you will find sinks and showers, just tap on everything that makes water sound and you will get eventually
Welcome
How to: you just have to enter the hotel
◊ all staff notes ◊
Conversations you will have to have:~ chat
~ what are you doing here?
after waking up on the second day:
~ where is my stone?
~ ask maid to clean your room
~ basement key
~ who’s A?
after you found out how to read A’s message:
~ what’s on the 4th floor?
~ chat with security guard untill she starts repeating herself
after figuring out how to reach 4th floor:
~ did you steal my stone?
jajaja