Here is the full list of all 100 Topless Hentai Mosaic achievements.
Without underwear, <3
Undressed!
T
O
P
L
E
S
Without Outerwear
Without a bra
<3
Without outerwear
Outerwear
Cho, 24
Hoshi, 21
Kaiyo, 23
Matsuko, 22
Anzu, 24
Chizu, 23
Ai, 21
Asuka, 20
Amaya, 22
Umi, 20
Sango, 24
Suzume, 22
Ruri, 21
Haru, 23
Akari, 20