Finished all puzzles but only got 68/100, how can I unlock the rest?

The title says "hentai" but the content is barely ecchi. What gives?

I've looked at it with friends and we cannot figure out what it is! please help.

Hi all, just finished the game (Achievements) but my steam completion rate hasnt changed. Has anyone else had this issue. Just trying to work out if its the game or an issue with steam? Cheers all

at least lower the volume