Similar to the first game, there is an achievement tied to beating the game without hints.
The Master Thaumaturge achievement will not unlock if you use any hints.

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Also, please note that this guide is not a walkthrough. If you would like a walkthrough, the following guide is pretty helpful!
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=3570266665

And if you want to know which choices lead to which endings, see this guide!
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=3570382098

On the days listed below, you have a choice to make which will affect an achievement.

Any other choices not listed here may or may not affect certain endings and the well-being of certain characters, but they will not affect the achievements.

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To get started, I recommend petting Jupiter (the cat) a minimum of once per customer until you get the Feline Priorities achievement.

• Who: Bonnie Robertson
  
• Hint: Maybe she should calm down and not make any crazy choices...
  
• Answer: Give her Grey's Grace.
  
• Which achievement: Catnapped, Not Forgotten

• What: Go to a specific location before you end the day
  
• Hint 1: Something was taken from you...
  
• Hint 2: Where was Jupiter hidden?
  
• Answer: Go to the Mary Bell (a boat at location #23) after meeting with Bonnie Robertson.
  
• Which achievement: Catnapped, Not Forgotten

• Who: Audrey Bell
  
• Hint 1: These are quite violent followers, they won't take well to being tricked...
  
• Hint 2: If Audrey doesn't show strength, something terrible might happen to her.
  
• Answer: Give her Fortinance.
  
• Which achievement: The Bleak Stones

• Who: Baron Potter
  
• Hint 1: Who knows what the gate might lead to? It could be dangerous without preparation.
  
• Hint 2: Using force is not the way to go...
  
• Answer: Give him Babellia.
  
• Which achievement: The Skull of Blencathra

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Note: you don't have to go to collect antiques today, you can save that for the epilogue.

There are three choices you can make on which location to go to. Once you go to one of the locations, you're locked in to that route. There are 8 different endings, depending on the choices you've made.

After you get each ending, go back to main menu and load your save from the beginning of Day 18.

• Where: The Pit
  
• Who: Eli White
  
• Hint 1: It is time to put this evil to a stop...
  
• Hint 2: You have the strength to resist its temptation.
  
• Answer: Give him the Nalean Casket
  
• Which achievement: Pillar of Calaris

• Where (hint): The Catacombs
  
• Where (answer): bottom right, Blencathra's skull
  
• Who: Baron Potter
  
• Which achievement: The Skull of Blencathra

• Where (hint): The ritual site
  
• Where (answer): The Bleak Stones
  
• Who: Audrey Bell
  
• Which achievement: The Bleak Stones

All the other achievements you will either get as you play, or can get them in the Epilogue after the main game is over. They aren't choice-restricted, so you don't have to watch out for anything as you play.

• Gotten during gameplay - unmissable
  
• How to get: Successful interaction with your first customer.

• Gotten during gameplay - unmissable
  
• How to get: Identify 10 items - serve 10 customers correctly.

• Gotten during gameplay - unmissable
  
• How to get: Solve your first clue card - new clue card is given every start of the day.

• Gotten during gameplay - unmissable
  
• How to get: Find the booklet on curses - Day 8, inside secret drawer.

• Gotten during gameplay - unmissable
  
• How to get: Open the locked section - Day 11, shelves on the left are unlocked with Ethereal Key

• Gotten during gameplay - unmissable
  
• How to get: Find the Thaumic Lens - Day 10 table tile puzzle

• Gotten during gameplay - unmissable
  
• How to get: Lift a curse from a customer.

• Gotten during gameplay - unmissable
  
• How to get: Catch a Wandering Shroud - Day 13, done with Spirit Shroud

• Gotten during gameplay - unmissable
  
• How to get: Use the bishop's square - specific to locations at the castle.

• Gotten during gameplay - unmissable
  
• How to get: Get one of the endings.

• Gotten during gameplay - unmissable
  
• How to get: Open a vault - the 3 slots in center lower shelf + clock puzzle.

• Gotten during gameplay or epilogue
  
• How to get: Solve all of the clue cards - one clue card given per day, visit all locations and collect objects.

• Gotten during epilogue
  
• How to get: Identify every item - this is done during the epilogue, just serve the remaining customers.

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For these ones you do have to do something out of the norm. Both can be done in Epilogue.

• Can get anytime after the item has been found.
  
• How to get: Put Holgen Grimm (the skull-looking mask) on Jupiter.

• Gotten during Epilogue
• How to get:
  
• Find the three artifact drawing pages (in your book) which have a little x in the corner.
  
• Put them on the 3 slots in center shelf, then solve the clock puzzle
  
• Go to the grave with the same marking
  
• One of the three required items is from the previous game's store, Strange Horticulture. Visit there on the map to get it!