Here is the full list of all 48 Hentai Picross achievements.
Kaguya Nakamura - Complete Level 6
Kaguya Nakamura - Complete Level 5
Kaguya Nakamura - Complete Level 4
Kaguya Nakamura - Complete Level 3
Kaguya Nakamura - Complete Level 2
Kaguya Nakamura - Complete Level 1
Hideko Tanada - Complete Level 6
Hideko Tanada - Complete Level 5
Hideko Tanada - Complete Level 4
Hideko Tanada - Complete Level 3
Hideko Tanada - Complete Level 2
Hideko Tanada - Complete Level 1
Fumiyo Saito - Complete Level 6
Fumiyo Saito - Complete Level 5
Fumiyo Saito - Complete Level 4
Fumiyo Saito - Complete Level 3
Fumiyo Saito - Complete Level 2
Fumiyo Saito - Complete Level 1
Karin Suzuki - Complete Level 6
Karin Suzuki - Complete Level 5
Karin Suzuki - Complete Level 4
Karin Suzuki - Complete Level 3
Karin Suzuki - Complete Level 2
Karin Suzuki - Complete Level 1
Yukie Seto - Complete Level 6
Yukie Seto - Complete Level 5
Yukie Seto - Complete Level 4
Yukie Seto - Complete Level 3
Yukie Seto - Complete Level 2
Yukie Seto - Complete Level 1
Risa Ando - Complete Level 5
Risa Ando - Complete Level 4
Risa Ando - Complete Level 3
Risa Ando - Complete Level 2
Risa Ando - Complete Level 1
Keiko Hayakawa - Complete Level 6
Keiko Hayakawa - Complete Level 5
Keiko Hayakawa - Complete Level 4
Keiko Hayakawa - Complete Level 3
Keiko Hayakawa - Complete Level 2
Keiko Hayakawa - Complete Level 1
Natsumi Otonari - Complete Level 6
Natsumi Otonari - Complete Level 5
Natsumi Otonari - Complete Level 4
Natsumi Otonari - Complete Level 3
Natsumi Otonari - Complete Level 2
Natsumi Otonari - Complete Level 1