Hollow Cocoon: 100% Achievement Guide (WIP)

This guide is heavily a WIP. I’m setting it public early, so people can follow along with its progress, especially for things like the coin games or endings. People can also freely discuss things they’ve found in the comments to help each other out.

Estimated difficulty: ?/10.

Estimated 100% time: ~? hours.

Offline/online achievements: 11 offline / 0 online.

Number of playthroughs: ?.

Glitched achievements: ?.

Missable Achievements: ?.

wip

Late into the Miyama Mansion area, you will need to fish a key item out of a room labelled “Toilet” to the top-left of the map. After you’ve done so, return to a room also labelled “Toilet” to the top-right of the map and stick your hand in there as well.

Video walkthrough for the notes coming soon.

10 Yen Coin
After walking off the bus at the start of the game, walk forward a few feet and look for an open metal gate on your left. Inside will be a swing with the coin on it.

10 Yen Coin
Leave the alley and walk forward a few more feet. On your left again will be a green vending machine with the coin inside.

10 Yen Coin
Across the street from the vending machine will be a small shack. The coin is on the bench in front of it.

10 Yen Coin
Facing the bench from the previous coin, turn to your left and head up the street, passing a bulletin board. Go up the small hill on your right near the house and walk along it, looking for a barrel on your left. The coin will be on top.

10 Yen Coin
Staying on this side of the road, keep moving forward to the next small shack. The coin will be on the bin hanging out on the left side of the shack.

10 Yen Coin x4
Cross the street and go up the stone steps to a tiny graveyard. The coins will be on one of the stones near the back.

Note (1/42) – Letter From the Village Mayor
Make your way to your grandmother’s house and enter the gate. Once you load in, open the red mail box in front of you.

10 Yen Coin
Go inside the house and open the door in front of you. Look to the left.

Note (2/42) – Old Picture 1
Open the door on your right, then open the small cabinet to the right of the altar.

Note (3/42) – A Letter From Minato as a Child
From the previous note, open the door to your right, then open the drawer on your left.

Note (4/32) – A Picture Drawn by Minota as a Child
Directly above the previous note, hanging on the wall.

10 Yen Coin
On the bookcase right of the previous note.

Note (5/42) – Kinu’s Memo
From the previous note, turn around and open the door. The note will be on the table in front of you.

10 Yen Coin
Go back to the room directly across from the front door again. This time, go through the next set of doors here. Go left, then left again into a small room. The coin is in the red drawer.

10 Yen Coin x4
Turn around and open the first door on your left to find a kitchen. The coins are in the drawer to the right.

Note (6/42) – Grandmother’s Daily Schedule
Still in the kitchen, look near the stove for a chalkboard schedule hanging on a wall.

10 Yen Coin
Continue through the kitchen into the backyard. Go right and you’ll spot a hen house you can enter. The coin is inside, along with an egg that will raise your defense.

Note (7/42) – Letter From Yui 1
Head back to the kitchen and walk out of the door. Enter the doorway directly across from you and look at the yellow mail holder on the right side of the room. Make sure you don’t rest here just yet!

10 Yen Coin
Turn around from the letter holder and open the sliding door. Go left and you’ll spot a small closet on your left that doubles as a save room. The coin is inside.

10 Yen Coin
Exit the closet and go straight towards the sink across the hall. The coin is on top.

10 Yen Coin
Open the door near the sink and look in top of the washing machine.

Note (8/42) – Saichi’s Response to Minato as a Child
Go back and enter the room next to the room we can rest in to progress the story. The note will be on top of a dresser to the left.

10 Yen Coin x4
In the drawer under the previous note.

Note (9/42) – Letter From a Doctor
After opening the combination lock door and watching the following cutscene, turn around and look on the table.

10 Yen Coin
On a small nightstand directly to the right of the previous note.

Note (10/42) – Saichi’s Response to Yui
From the previous coin, look left for a drawer you can open. A green cushioned chair is in front of it.

Note (11/42) – Letter From Eiji
As soon as you load in, look on the counter in front of you.

10 Yen Coin
In the cabinet to the right of the coin machine.

10 Yen Coin
Head upstairs and wrap around the corner to find this on a stack of cushions to your right.

Note (12/42) – The Legend of Princess Mayu
In front of the window near the previous coin.

10 Yen Coin
After solving the scroll puzzle, go downstairs and crawl through the now opened hatch. It will be on your left as you enter.

Note (13/42) – Plea From the Dungeon
Continue down the path into a mineshaft of sorts. You’ll eventually come to a room with a large wooden cage in it. Enter the cage to find the note.

10 Yen Coin
Right next to the previous note.

Note (14/42) – Miyami Silkworm Records
Just beyond the cage is a staircase leading upwards. As soon as you open the door at the top, the note will be on a shelf directly in front of you.

10 Yen Coin
Behind the shelf that held the previous note.

Note (15/42) – Red Talisman
As soon as you go through the trick wall and load in, look next to the save talisman.

Note (16/42) – Picture of Ayano
To the right of the previous note.

Note (17/42) – Miyami Family Tree
Continue forward a small ways through 2 more sliding doors. Before you open the 3rd set, look right to spot a black dresser you can open.

Note (18/42) – Young Saichi’s Journal 1
Enter the next set of sliding doors, then open the set to your right to spot the note in front of you.

10 Yen Coin
From the previous note, go left and enter the first door you see to find a small bathroom. Open the large stall to find the coin.

Note (19/42) – Letter From Yui 2
After having a door busted down on you, you will eventually exit out into a courtyard with a well on your left. Go to the other end of the courtyard and open the sliding door, then enter the room on your left. The note will be on the small table.

10 Yen Coin
Directly to the left of the previous note.

Note (20/42) – Young Kinu’s Journal 1
You’ll shortly make your way up to the 2nd floor and will need to use a plank to pry a door open. Enter the room and look to the right.

10 Yen Coin
On the opposite side of the debris, where you found the wooden plank.

10 Yen Coin
From the last coin, head down the staircase just a few steps away and you’ll spot a cabinet you can open across the room. The coin is inside.

10 Yen Coin
Open the door to the right of the last coin and enter the room in front of you. The coin will be on the stone stove.

Note (21/42) – Young Saichi’s Journal 2
In the same room (Kitchen), look to your left to spot a door you can open (labelled Closet on the map). You have to come to this room to find Firewood. The note is inside.

Note (22/42) – Servant’s Lost Item
From the previous note, turn around and enter the room directly across from you. It will have a red steamer trunk to the right you can hide in. The note is on the table nearby.

10 Yen Coin x4
From the last note, go through the door to your right, then go left. At the T-junction, go right and open the door you’ll immediately pass by to find a save room. The coins are inside.Note (23/42) – Complimenting the Plate
Exit the save room and go right. Along the left wall will be a wooden bar you can remove to access a shortcut. With the Crowbar Key in hand, make your way down the hall to the Crowbar Closet to find the note inside.Note (24/42) – Young Kinu’s Journal 2
After acquiring the “Crowbar”, return to the pot you fished the Crowbar Key out of. Head back upstairs to the room that contained a hole in the floor that was boarded up. Remove the boards and drop down to find the note on your left.

Note (25/42) – Young Kinu’s Journal 3
Head back to the locked door that’s next to the The Counting Rod Closet and use the Peony Key to open it. Now outside in another courtyard, open the first door on your left

10 Yen Coin
Behind the divider in the same room as the last note.

10 Yen Coin
Exit the room and enter the next one to your left, then go through the next set of doors to the Entrance. The coin is on the right.

Note (26/42) – Hiding the Mulberry Crest
Exit the room and go left again. Around the corner is a door that leads to the Altar Room. Once inside, you can find the note near the middle of the small room.

Note (27/42) – Saichi’s Journal 1
Inside the shrine in the same room as the last note.

10 Yen Coin
Head back out to the Courtyard and open the door just ahead of you and to the left. The coin is in a cabinet on the left side of the room.

Note (28/42) – Young Saichi’s Journal 3
From the previous coin, open the 2 sliding doors that lead to the room labelled “Hall’ on the map. The book will be on the little podium in the center of the room.

Note (29/42) – Kyubei’s Journal 1
From the previous note, enter the hallway that connects the Hall to the Library and go to the end. The note is on a table to the left.

10 Yen Coin x4
Exit the hall and enter the room labelled “Baths” on the map to find a save room. The coins are in the tub.

Note (30/42) – Saichi’s Journal 2
After finding the Counting Rod Key, make your way back to the Counting Rod Closet and unlock it. The note will be directly in front of you.

10 Yen Coin
In a drawer to the left of the previous note.