Here is the full list of all 14 Fate and Life: The Mystery of Vaulinhorn achievements.
Maive rejected Matias's lotion offer
Matias peeped at Maive
Matias gave Maive a volleyball lesson
Maive declined Matias's volleyball lesson
Maive played the poker game
Maive chased Alfred instead of playing poker game
Alfred helped Maive feel better when she had a headache
Maive gave Nayla a massage
Maive accepted Xander's invitation
Maive accepted Hanz's request
Maive offered to wear the daring swimsuit
Alfred chose Joyce over video games
Maive wore a special outfit at night
Maive and Joyce accepted the dance