Here is the full list of all 20 Hentai Story Red achievements.
Assemble the first picture with Jenny
Assemble the first picture with Diana
Collect all pictures from Jenny
Collect all pictures from Diana
Assemble the first picture with Naomi
Collect all pictures from Naomi
Assemble the first picture with Avery
Collect all pictures from Avery
Assemble the first picture with Tiffany
Collect all pictures from Tiffany
Assemble the first picture with Stella
Assemble the first picture with Pamela
Collect all pictures from Pamela
Assemble the first picture with Miranda
Collect all pictures from Miranda
Assemble the first picture with Kelly
Collect all pictures from Kelly
Assemble the first picture with Candy
Collect all pictures from Candy
Collect all pictures from Stella