Here is the full list of all 9 Hentai Casual Slider 2 achievements.
Thank you for playing Hentai Casual Slider 2!
Play your first puzzle
Open the Gallery for the first time.
Cheat for the first time.
Play two puzzles in Hentai Casual Slider 2.
Play three puzzles in Hentai Casual Slider 2.
Play four puzzles in Hentai Casual Slider 2.
Play five puzzles in Hentai Casual Slider 2.
Pause the game for the first time.