Full list of all 11 Memoranda achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
All achievements
Achievements they've won
Achievements they've not won
Took every humanimal's photo.
Found all the backer pictures.
Changed the music in Mizuki's home.
It starts with "Monkey".
Helped the stranded sailor.
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.
Found the frequencies for Qardash.
Solved the puzzles in the doll maker's house.