Here is the full list of all 100 Lady's Hentai Mosaic achievements.
Without underwear, 18+
Without a bra
Without outerwear
Outerwear
Tracy, 19
Nyoko, 20
Jennifer, 23
Tanya, 21
Fumiko, 24
Gloria, 22
Maria, 21
Kaori, 23
Akiko, 22
Leia, 20