Here is the full list of all 11 Hentai - there are Area 51 achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
HENTAI SOLDIER - 10
Vuydu zvidsu rozbiynuk
30 kill? Really?
Reptiloid
Paltatin Power
What the fuck are you?!
HENTAI SOLDIER - 70
Help! Help!
My life....
Breathtaking
The purpose of life is fulfilled!