This guide describes in detail the location of the pumpkin charms and the pumpkins themselves.

I finally found the place where I got the number wrong, and now the manual shows the correct amount of charms found in the search. But even if you still find a mistake somewhere, I'd be happy to point it out in the comments.
In brackets are the names of the locations they are described in the yaml files.

Pumpkinator:
• It is possible to talk to all the pumpkins on the first playthrough, but not necessary. I advise you to do it on the new game+, because it's most likely on the second playthrough you'll collect all the regalia, and you need them to unlock the last five pumpkins at the end of the game.
  
• Blue pumpkins, i.e. developer comments, do not count for achievement. But if you want to find all of them, pay attention to the "DULL GLASS" location, there are two blue pumpkins.
  
• Check the pumpkins when something changes in the location. Sometimes the achievement only counts pumpkin after you have seen all the possible dialogues. That's why it's best to double-check the pumpkins every time something changes.
  
• For my convenience, I count the pumpkins individually, even if they have the same dialogue or are combined into one pumpkin with the same interaction.

Pumpkin Charmer:
• It is not possible to get this achievement on the first playthrough. Some charms only appear on a new game+.
  
• If you want to find all the charms and not think where you missed them, you either find all available 158 charms on the first playthrough and the other 42 on the second playthrough, or ignore them in the first playthrough so you can pick them up in the second playthrough.
  
• Please don't ask me about missing charms. Most likely you just didn't fully inspect the object or the background somewhere. As you pick up the last charm, you will immediately get this achievement.
  
• My friend, for which I thank him very much, calculated the total number of charms. You can use them as a reference point if you're going through the game in areas to get the achievement.

You can use the information below to create a video guide (well, just in case), just don't forget to include a link to this guide in the description. And thanks to everyone who reported mistakes in the guide!

Update: I added a bunch of screenshots of problematic locations and also asked a friend to do a video guide. So now it's definitely a completed guide.
Update 2: In the comments asked to add screenshots in all locations, which I did. I have also now detailed the location of the pumpkins.

Together, my friend and I finally recorded a video showing all the charms. So if you're not sure where to look for a charm, look just below. And if you liked it, please like it! xD
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2987467150

The prologue ???? has no charms.

Pumpkins:
• 1 to the right of the couch and to the left of the door
  
  
• 2 to the left of the statues
  
  
• 1 to the left of the left room <:D
  

Charms:
• Only in the new game+, on the floor - 3 charms
  

Pumpkins:
• 1 to the right of the creature
  

Charms:
• Eye jars to the left of the creature - 2 charms
  

Don't forget to talk to everyone again when you go to pick up the pocket mirror.

Pumpkins:
• 1 from the top of the entrance to the location
  
  
• 1 in front of the window on the left
  
  
• 1 at the bottom in front of the picture on the right
  

Charms:
• Appears after interacting with painting "Satisfaction" 1800, to the left of it - 1 charm
  

Pumpkins:
• 1 at the fork in the road
  

Pumpkins:
• 2 to the left of the entrance to the location
  
  
• 2 to the right of the dining table
  
  
• 2 to the right-top of the couch
  
  
• 1 to the left-top of the table
  

Charms:
• Blue shadow on the couch before or after dinner - 3 сharms
  
  
• Fireplace - 3 сharms
  
  
• Yellow shadow on upper row second from the right during dinner - 1 charm
  
  
• Smooth Pumpkin Mousse on the table - 2 charms
  
  
• New Game+, Egliette's secret room (needs key) - 3 charms
  

Pumpkins:
• 1 at the bottom of the table
  
  
• 1 from the door on the right
  
  
• 2 pumpkins above and below on the couches
  
  
• 1 on top of the couch to the right of the fox's head
  
  
• 1 from the piano on the right
  

In the version 1.1.4 removed the need to talk to pumpkins in the bloody ballroom for achievement - they are technically 'same ones' as the normal ballroom ones.

Charms:
• Piano - 3 charms
  
  
• Vases with roses near the door with roses on top - 2 charms
  
  
  
• New Game+: on the floor after the massacre (after the Fleta Theatre) - 3 charms
  

Pumpkins:
• 1 to the left of the entrance to the location
  
  
• 1 upstairs room
  

Charms:
• Vases with flowers on the left and right in the room with boxes upstairs - 4 charms
  
  

Pumpkins:
• 1 to the left of the entrance to the location
  
  
• 1 at the bottom
  

Charms:
• The two dresses on the right - 3 charms
  

The location of the past is not duplicated, but just remember to talk to all the pumpkins before you sit down.

Pumpkins:
• 1 right-bottom of the gifts
  

Charms:
• Closet on the left - 3 charms
  
  
• Gifts on the right - 3 charms
  

Pumpkins:
• 1 left-top of the theater
  
  
• 1 right-top of the theater
  

Pumpkins:
• 1 left-top of the butlers
  

Charms:
• On the floor after checking the pumpkin - 1 charm (there is a bug, the charm can spawn after loading the save) has been fixed in the version 1.1.4
  
  
• Painting “Feline Glory” 1846 - 3 charms
  
  
  
• Central butler top - 2 charms
  

Pumpkins:
• 1 at the top-left of the entrance to the location
  
  
• 1 at the top-left of the entrance to the location
  
  
• 2 left along the way
  
  
  
• 2 right along the way
  
  

Pumpkins:
• 1 to the left of the entrance to the location
  
  
• 1 to the right of the entrance to the location
  
  
• 1 left-top of Eglietta
  
  
• 1 right-top of Eglietta
  

Charms:
• New Game+: on the floor above-right - 3 charms
  

Pumpkins:
• 1 top-right of the entrance to the location
  

Pumpkins:
• 1 from the top-left on the couch
  
  
• 1 from the top-right on the couch
  

While you are with Fleta, don't forget to interact with all available pumpkins before you exit to the garden.

---

Total Charms: 36 original + 12 remake = 48

If you're having trouble achieving "Pumpkinator", pay special attention to the Fleta area; this is probably where you missed out on a pumpkin or two.
Don't forget to talk to the pumpkins until you've exhausted all dialogue options.

Pumpkins:
• You will see the first 3 pumpkins near to the gazebo.
  
  
• There is 1 hidden pumpkin near the forbidden place. Together with Fleta, check the candy.
  
  
• In addition to a bunch of pumpkins, there are 3 pumpkins that have their own dialogue.
  
  
  
  
• Near the gazebo, if you go down, you will see 1 pumpkin.
  
  
• Finally, when you follow the right path, you will see 1 pumpkin.
  

Charms:
• The stone bench under the tree - 2 charms
  
  
• Statue of a fork, a cake and a rabbit - 2 charms
  
  
• Gazebo - 2 charms
  
  
• Dispute between the pumpkins - 3 charms
  
  
• Pumpkin wheelbarrow - 1 charm
  
  
• All scarecrows - 3 charms
  
  
  
  
• New Game+: on the floor near the second tree - 3 charms
  

Pumpkins:
• 1 to the left of the entrance to the location
  
  
• 1 on the left of the Dollhouse
  
  
• 1 on the right of the Dollhouse
  

Charms:
• Pumpkins down to the archway on the right - 3 charms
  

Pumpkins:
• 1 on the right side of the stairs
  
  
• 2 to the left of the entrance to the location
  
  
• 2 to the right of the entrance to the location
  
  
  
• 1 at the top after the stairs
  

Charms:
• Table with lamp at bottom right - 3 charms
  

Pumpkins:
• 2 left before the table
  
  
• 1 on the right after the table
  
  
• 1 on the left in the game room with an explanation of the rules
  
  
• 1 on the right next to Fleta
  

Charms:
• Stained glass windows - 4 charms
  
  
  
• The pumpkin in the dining room on the right, interact twice - 2 charms
  

Charms:
• Stained glass windows - 4 charms
  
  
  
• Black dress on the left in the mirror room (take it before you start looking around the mirrors with Fleta, need to interact with the dress twice) - 1 charm
  
  
• Vase with roses on the window on the right side of the library - 3 charms
  

Charms:
• Stained glass windows - 4 charms
  
  
  
• The chair on the left in the planetarium - 3 charms
  

Be sure to examine everything BEFORE sitting down to play with Fleta.

• Toy chest on the left - 3 charms
  
  
• Toy house on the right - 3 charms
  

Here there are 2 pumpkins, the second one you will see only at the end of the escape, you can find it near the end of the corridor to the right from the green doll. Also during the escape check the first pumpkin again.

Charms:
• Broken rocking horse - 2 charms
  
  
• The doll that is next to the clown tower - 1 charm
  
  
• The blue doll on the floor with the bear's head - 1 charm
  

Pumpkins:
• 2 on the left and right in front of the fountain
  
  

Charms:
• New Game+: on the floor to the right of the fountain - 3 charms
  

And don't forget to check the pumpkin before jumping into the hole.

---

Total Charms: 50 original + 6 remake = 56
The total should be 86 / 104 charms.

In the version 1.1.4 fixed charm position in new game+ that wasn't supposed to be accessed in the normal game.

Charms:
• Vase with flowers to the right from the fireplace - 3 charms
  

Charms:
• New game+: the left corridor at the end of the dead end (take it before entering the library) - 3 charms
  
  
• Broken vase on the left in the center of the corridor (there is a bug, take it before entering the library) - 2 charms
  
  
• Broken vase on the right in the center of the corridor - 1 charm
  
  
• Floor clock on the right side - 1 charm
  
  
• Nightstand at the bottom to the stairs - 2 charms
  

Charms:
• 1st floor, leftmost table with a clock - 2 charms
  
  
• 2nd floor, right floor clock - 2 charms
  

Pumpkins:
• 1 to the right of the music box
  
  
• 1 far left on the couch
  
  
• 1 on the left below the picture
  

Charms:
• Nightstand on the left side under the painting - 2 charms
  
  
• Nightstand on the right side - 2 charms
  

Charms:
• The three paintings to the left of the door - 2 charms
  
  
• “Crimson Waters” 1523 painting to the right of the door - 1 charm
  
  

Pumpkins:
• 1 from the top of the table
  
  
• 1 to the right of the table
  

Charms:
• Quizzical Pumpkin (Answers: 3 or 44) - 2 charms
  

Only available in new game+.

Charms:
• Mirror - 3 charms
  
  
• Diaries near the bed - 3 charms
  

Charms:
• Nightstand to the right - 1 charm
  
  
• Nightstand on the left - 1 charm
  

Charms:
• Vase on the right - 1 charm
  
  
• Vase on the left - 1 charm
  

Pumpkins:
• 1 from the top-right down the hallway
  

Pumpkins:
• The quarters are down the hall to the left
  

Pumpkins:
• 1 on the right side of the couch
  

Charms:
• The telephone nightstand on the left - 2 charms
  

Charms:
• New Game+, on the floor in the dead end - 3 charms
  

---

Total Charms: 28 original + 12 remake = 40
The total should be 114 / 144 charms.

Here is 1 unmissable pumpkin.

Charms:
• Blades on the couch after taking a pumpkin (holding the pumpkin) - 3 charms
  

Charms:
• New Game+: on the right on the floor right before the chase - 3 charms
  

Charms:
• Bed - 3 charms
  

Charms:
• Left side bottom cup tower - 1 charm
  
  
• Left side bottom center cup tower - 1 charm
  
  
• Left side upper center cup tower - 1 charm
  
  
• Left side upper cup tower - 1 charm
  
  
• Right side lower cup tower - 1 charm
  
  
• Right side lower center cup tower - 1 charm
  
  
• Right side central cup tower - 1 charm
  
  
• Right side upper center cup tower - 1 charm
  
  
• Right side upper cup tower - 1 charm
  

Charms:
• Carousel horse to the right - 3 charms
  

Charms:
• Blue rabbit on the right - 3 charms
  

Charms:
• New Game+: on the floor to the end of the dead end - 3 charms
  

Charms:
• Big tree - 3 charms
  

Charms:
• Diary on the right - 2 charms
  
  
• Diary on the left - 2 charms
  

Charms:
• New Game+: circular dead end where the Lisettes appear - 3 charms
  
  
• New Game+: a dead end with Lisette wearing crown and scissors - 3 charms
  

---

Total Charms: 28 original + 12 remake = 40
The total should be 142 / 184 charms.

• Candlestick near the music box - 1 charm
  
  
• Nightstand under the picture - 2 charms
  
  
  
• Candlestick near to the picture - 1 charm
  
  
• The cabinet with gramophone - 2 charms
  
  
• Candlestick near the cabinet - 1 charm
  
  
• Nightstand near grandfather clock - 2 charms
  
  
• Nightstand with flowers and clock - 2 charms
  

• Sewing machine - 2 charms
  
  
• Spinning wheel - 3 charms
  

There are 5 pumpkins here, but you can only talk to them if you have all the regalia.

---

Total Charms: 16 original, no extra in new game+

Total on the playthrough: 158 original pumpkin charms + 42 remake = 200 charms

I.e. 200 is the maximum number that opens all the locks in the "Extras" menu.

A screenshot of the final result (don't pay attention to the 3 charms, just a friend took the bug charms from Yarn Hall):