Just a checklist showing the general location of memories, not a full guide. Some of the memories will become irretrievable after certain actions. Most of the memories will be irretrievable once you release the 7th sign.
On another note: The “Frenzied Librarian” Achievement counter counts up to 11 memories, but there are a total of 12. I’m not sure if this is intended, or an oversight.
Convergence
Note: The memory with the bench is only accessible after the 6th sign is released and will be irretrievable after the 7th sign is released.
Black Tower
Shattered Vault
Note: You will not be able to return to this memory after releasing the sign and leaving.
White Hall
Note: You will not be able to retrieve the memory after releasing the sign.
Crossroads
White Tower
Forge
Note: You will not be able to return to the forge once you leave.
