Full list of all 44 恋爱关系/Romance achievements.
The base game contains 19 achievements, and there are 2 DLC packs containing 25 achievements.
Consistent choice
Complete Chapter 7
CG full collection
The comfort of warmth and lingering
HCG full collection
Complete Chapter 6
Complete Chapter 5
The beauty that is hard to let go
Complete Chapter 4
Cooking food together
Accidentally cut finger
Resist the bad temptation
Complete Chapter 3
Received all the travel photos
Complete Chapter 2
The one who pretends to sleep cannot be woken up
Complete Chapter 1
Taught a demented man on the subway
Open the game for the first time
Unlock all CGs
Choose a bunny girl for the first time
Unlock special episode 4
Choose boyfriend shirt for the first time
Unlock special episode 3
Unlock special episode 2
Unlock special episode 1
Complete Chapter 13 twice
Complete Ending 2
Complete Ending 1
Complete Chapter 12
Complete Chapter 11
Get Understanding From Yuki
Complete Chapter 10
Complete Chapter 9
Choose Nana-Hiroshu for the First Time
Choose Shinta-Chika for the First Time
Complete Chapter 8
Open FINAL for the first time