Here is the full list of all 100 Busty Hentai Mosaic achievements.
Without underwear, <3
This is B
This is U
This is S
This is T
This is Y
Outerwear
Without Outerwear
Without a bra
<3
Undressed!
Without outerwear
Katsuki, 20
Tora, 19
Sugi, 24
Rin, 22
Mikasa, 20
Kana, 19
Hisoka, 23
Nishi, 22
Shiniqua, 19
Tsubasa, 21
Utano, 22
Maeko, 20
Koemi, 19
Emi, 20
Akem, 21