Here is the full list of all 14 Secret Psychology achievements.
Clear all one's achievements
See a depraved ending
See the end of one's mind
I watch all the hidden stories
Clear all the puzzles with 3 stars
Clear all puzzles
Achieving a total of 10 stars
Achieving a total of 20 stars
Achieving a total of 30 stars
Solve Yoriko's troubles
Solve Kurumi's troubles
Solve Kumiko's troubles
Solve Masumi's troubles
Take off the glasses of Kumiko