Here is the full list of all 36 Hentai Students: Love Puzzle achievements.
Please Kate
Fully upgrade Kate
Give 1 gift to Kate
Give 2 gifts to Kate
Give 3 gifts to Kate
Give 4 gifts to Kate
Please Julia
Please Gloria
The true value of this treasure is known only to those who were looking for it.
Fully upgrade Gloria
Give 4 gifts to Gloria
Give 3 gifts to Gloria
Give 2 gifts to Gloria
Give 1 gift to Gloria
Fully upgrade Julia
Good. Bad...I'm the guy with the balls.
Give 2 gifts to Julia
Give 3 gifts to Julia
Give 4 gifts to Julia
Give 1 gift to Julia
Please Anna
Fully upgrade Anna
Someone lacks one woman, while another lacks life to love one and only one.
Give 4 gifts to Anna
Give 2 gifts to Anna
Give 3 gifts to Anna
Give 1 gift to Anna
Please Emily
Fully upgrade Emily
Veni, vidi, vici
Give 4 gifts to Emily
Give 3 gifts to Emily
The first step to something bigger
At the start, you can always see which horse will win and which will lose.
Give 1 gift to Emily
Give 2 gifts to Emily