Here is the full list of all 23 My Memory of Us achievements.
Complete all levels
Complete „The Leviathan”
Find all Memories
Complete „Changes, Changes, Changes” without alarming any enemies
Set all the posters without starting any alarm in "Call To Arts"
Deliver the love letter in „The Leviathan”
Get the key with 3 or less drone route changes in „The Forest”
On "Interrupted Adventure" after you find the Girl never again leave her in the darkness
Win the boss fight without taking more than 3 hits in „Parents, Bathtub and Giant Fish”
Play the game on September 1st
Visit one node in the labyrinth 3 times in „Parents, Bathtub and Giant Fish”
Finish printing without making mistakes in „Call To Arts”
Find the truth behind propaganda in „The Leviathan”
Complete ball minigame in „Parents, Bathtub and Giant Fish” in less than 40 seconds.
Complete labyrinth mingame in „Parents, Bathtub and Giant Fish” in less than 40 seconds.
Complete „The Inferior World”
Find half of the Memories
Complete bike minigame without any mistakes in „Inferior World”
Complete „You're Not Alone Anymore”
Make no more than 2 mistakes while dancing in „The Thief’s Duty”
Finish dinner puzzle in 13 moves or less in "Roof Over The Head"
Put 3 apples in the basket with one shot in "Roof Over The Head"
Take her hand for the first time