Here is the full list of all 20 My Summer Adventure: Memories of Another Life achievements.
You completed the prologue.
You made a fateful decision.
You caught Kyoko for the second time.
You lied to Kyoko.
You sorted out your feelings.
Kyoko got rid of the diary.
Just Kyoko.
Kyoko found happiness.
Kyoko came back home.
Kyoko finished what she’d started.
You had a great day at the university.
You started reading Yukio Mishima’s books.
You decided to listen to music.
You learned the plot of Kotonoha’s novel.
You became close to Kotonoha.
You shouldn’t have talked about Shihane.
You failed to get closer to Kotonoha.
One day it will end.
You did all you could.
Maybe there’s still a chance?