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