What Lies in the Multiverse

Here's a list of all the memories that can be found in the game.

These memories must be gathered in one save file, using chapter select if needed.

You can check which memories you have under "Memories" section on the game menu, or by pressing during a chapter.

Chapter 1 (4):

• Paper sheet with an arrow
• Bloody diary
• Blue cover diary
• Newspaper

Chapter 2 (3):

• Heart necklace with pictures
• Paper sheet with text
• Paper sheet with colorful drawings

Chapter 3 (2):

• Ragdoll
• Newspaper

Chapter 4 (4):

• Manga keychain
• Yellow flowers in a pot
• Plant care instructions
• Theater poster

Chapter 5 (3):

• Map with a river
• Bloody paper sheet
• Sandwich in a plastic bag

Chapter 6 (2):

• Black security card
• Orange ray gun

Chapter 7 (3):

• Cassete tape
• Manga body pillow
• Wizards with boxe gloves poster

Chapter 8 (2):

• Everett's memories (14 in total) (*)
• Picture of Everett and Ez

(*) Unsure if all the 14 are needed. There are reports of the achievement unlocking with some of Everett's memories, but I recommend getting all of them just to be sure.

Final chapter (1):

• Everett's purple hat (**)

(**) This memory is rewarded automatically after everything in the game, when Kid is back home. Unsure if it's needed, since there are reports of the achievement unlocking before getting this memory.

Personally, this achievement popped for me in the very last moments of the playthrough, after the credits and everything else. At that point, I had all of the listed above.

As for the locations of the memories, please check this video by You Tube user Carrot Helper (all credit to them):