Hi everyone! I decided to make this guide to... well.. guide you (duh) through achievements.
As I wrote in the description there are no super hard to get achievements on this game. There are a few story related ones which you will get just by going through it; some others involve getting upgrades for your business (which most of you will probably get anyway) and then you have a few where you need to go a little out of your way to get them. There are no missable achievements however and you can easily make them all in one playthrough.

The achievements listed here are unlocked by just going throught the story. You can't miss them and most of them are scripted. You won't really need to do anything since the game takes control of the situation.

• Epistolary relationship
  Receive the first letter
  
  When you are opening the shop for the second day (not counting the tutorial day) you get a cutscene where the characters receive a letter. After that you have to go to the Upgrades menu and then go into the Mail tab. You simply need to read the letter. Is very intuitive since you get a pretty visible red exclamation mark that's going to guide you.
  
  
• Annoying blonde guy
  Take Elliot's measurements
  
  Eventually you will get a visit from this guy and the achievement will pop-up. You don't really need to do much since it's a scripted event so to speak.
  
  
• What a thud!
  Help Gilbert
  
  Same as the last guy. Scripted event. It will eventually pop-up as completed just by following the storyline.
  
  
• In a better place
  Find out where Elisewin is gone
  
  Eventually you will receive letter n°8 at the end of the day. Just read the letter and the achievement will pop-up.
  
  
• A faulty woman
  Make a new dress for Yvonne
  
  Same as the first 2 achievements this mistress will eventually come to your business. Again, scripted event.
  
  
• Ravenous Devils
  Who is the real devil in the end?
  
  This is the final story related achievement which match with the end of the storyline (at least for now).

This achievements are all related to buying upgrades for the businesses as the name suggests.

• Shhh... he doesn't know
  Hire an attendant
  
  To unlock this achievement you simply need to buy the Attendant upgrade from the menu.
  
  
• Green thumb
  So, you got into gardening
  
  This achievement will pop-up once you unlock the first vegetable upgrade; be it onions, potatoes or tomatoes.
  
  
• Friendly paw
  Buy a warm couch for your cat
  
  You simply need to buy the Cat upgrade to unlock this achievement.
  
  
• Gourmet chef
  Learn all your grandma's recipes
  
  After you've bought all the possible ingredients you will get this achievement. It requires all meats and all vegetables as well as the eggs.
  
  As the achievement description says you need to unlock all the recipes on the book in order to get this achievement. For this you're required to unlock all the meats, all the vegetables, the eggs AND the cat, since it adds 1 recipe to the book as well.
  
  
• Men devouring men
  Buy all tables. Now you're not just doing takeaway, you have a real restaurant!
  
  As the description suggests you simply need to buy the 4 tables for Hildred's tavern and voilà.
  
  
• House of horrors
  Get all the upgrades. Mr. T would be proud
  
  After you've bought all the upgrades for both businesses this achievement will pop-up.

In this section I will put all the remaining achievements which don't fit in the last categories.

• It's not that rusty
  Produce minced meat 20 times
  
  For this achievements you simply need to use 20 corpses on the Meat grinder machine to produce Minced meat.
  
  
• Anyone else?
  Anyone else?: Use your scissors 50 times on your clients
  
  You will need to kill 50 clients with Percival´s scissors.
  
  
• I'm sorry, no bikini here
  Buy a new outfit (it's not for Vicky this time)
  
  After you buy the first skin for either Percival or Hildred you will get the achievement.
  
  
• Stocked shop
  Open the shop with the displays and the mannequins full
  
  You need to open the shops with all the displays stocked. Note that you wil need to unlock the 4 food displays for Hildred's tavern and the 4 mannequins for Percival's tailor shop in order to unlock the achievement.
  
  
• Feed me all night long
  Fertilise the unusual plant in the greenhouse and make it sprout up
  
  After you unlock the greenhouse Percival will mention some seeds he found on a client. You simply need to fertilize the mysterious seeds 10 times until the plant matures.
  
  
• Mum?
  Act like a good parent
  
  This little boy comes to Hildred's tavern every now and then. At some point after you end a day with more than $100 he will appear and Hildred will give him the money. At this point you will get the achievement.
  
  Note: Not sure if there is a cap on how much she gives to him but as far as I know she gives him all the money, not just $100 as some guides claim.
  
  Note 2: This achievement is not missable. In case you never had the money available to be given to the boy it's still possible to get the achievement after the story finished as long as you have $100 or more available at the end of any given day on your current playthrough. There is no need to start a new game for this achievement alone.
  
  
• A really strange machine
  Produce sausages 20 times
  
  Same as with the It's not that rusty achievement you need to use 20 corpses on the Sausage stuffer to produce Sausages.
  
  
• A boring day
  You didn't use your scissors today. It was boring, wasn't it?
  
  To unlock this achievement you can't kill any of Percival's clients for one day.
  
  
• Oink!
  Play with the sign 10 times
  
  To unlock this achievement you need to click Hildred's tavern sign at the entrance 10 times. To do this simply hold the right click and move the mouse towards the right. That way you will drag the screen and will be able to see the street. At this point just click the sign until the achievement pops.
  
  
• Evergreen jokes
  Do you like black humour? No? You'll like it, trust me
  
  This achievement is a bit of a "spoil". I use quotation marks because the achievement image spoils everything by itself if you can put 2+2. Anyway, this achievement is related to the plant grown in the Feed me all night long achievement. You simply need to click the plant which will tell 20 different black humour jokes. When the last joke is seen before the cycle starts again the achievement will pop-up.
  
  
• Slaughterhouse
  Produce steaks 20 times
  
  Same as with the It's not that rusty and A really strange machine achievements you will need to use 20 corpses on the Stakes table to produce Steaks. After that the achievement will pop-up.

At this date this are all the achievements. If the devs add any new through DLC's or whatever I will try to keep it up to date. Feel free to make any suggestions or correct me if I made any mistake in the comments section. Until next time!

Aside from anyone involved in the development of this little gem I would also like to thank:

T.I.L.S.S. for the input on the Gourmet chef achievement.

Naisus for the input on the Mum? achievement.