Here is the full list of all 16 Hentai 2+2=4 achievements. It takes around 0-1 hour to unlock all of the achievements.
L blue achievement!
L red achievement!
Disagree blue achievement!
Disagree red achievement!
You PRO blue achievement!
You PRO red achievement!
X achievement!
X red achievement!
Heart red achievement!
Cube blue achievement!
Cube red achievement!
Like blue achievement!
Like red achievement!
Heart blue achievement!
PCube blue achievement!
PCube red achievement!