Here is the full list of all 10 Paranormal Teens achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Unlock Sissy's Happy Ending
Unlock Zaa's Happy Ending
Unlock Greg's Happy Ending
Unlock Mike's Happy Ending
Didn't Save the Girl
Unlock Jose's Happy Ending
Unlock Educational Resources
Unlock Tina's Romantic End
Unlock Truth
Saying Something Stupid