Here is the full list of all 100 Busty Hentai Mosaic achievements.
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
Outerwear
Without outerwear
Without a bra
Without underwear, <3
Undressed!
This is B
This is U
This is S
This is T
This is Y
Without Outerwear
<3