Here is the full list of all 9 Hentai Casual Slider achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Open the Gallery for the first time.
Play five puzzles in Hentai Casual Slider.
Play four puzzles in Hentai Casual Slider.
Play three puzzles in Hentai Casual Slider.
Play two puzzles in Hentai Casual Slider.
Play your first puzzle
Cheat for the first time.
Pause the game for the first time.
Thank you for playing Hentai Casual Slider!