There are many special achievements in "Silent Luck", and Yimi is one of them. If you want to achieve this achievement, you only need to lock your eyes on "Yimi" for 10 seconds. You can do it 7 days before the crash. Day (Chapter 4) / One day before the crash (Chapter 18) / The day of the crash (Chapter 20) to complete any chapter.
How to achieve silent misfortune Yimi achievement
Yimi
Keep your eyes locked on "Yimi" for 10 seconds
It can be completed in any chapter: 7 days before the crash (Chapter 4) / 1 day before the crash (Chapter 18) / the day of the crash (Chapter 20)
Find the "YIMPY sticky note" on the wooden board on the wall of the infirmary. Place the sticky note in the center of the screen for 10 seconds to unlock the achievement