Here is the full list of all 11 Memoranda achievements.
It starts with "Monkey".
Took every humanimal's photo.
Helped the stranded sailor.
Found all the backer pictures.
No one's stopping you now!
Seems like he had an appropriate name!
Managed to get the card "signed" by Phil.
Found the Spaghetti Man.
Changed the music in Mizuki's home.
Found the frequencies for Qardash.
Solved the puzzles in the doll maker's house.