Here is the full list of all 20 Love Hentai and Puzzles: Gamer Girls achievements.
Girl 601
Girl 602
Girl 603
Girl 604
Girl 605
Girl 1351
Girl 1352
Girl 1353
Girl 1354
Girl 1355
Girl 2401
Girl 2402
Girl 2403
Girl 2404
Girl 2405
Girl 3751
Girl 3752
Girl 3753
Girl 3754
Girl 3755