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 Educational Resources
Unlock Sissy's Happy Ending
Unlock Truth
Unlock Greg's Happy Ending
Unlock Jose's Happy Ending
Unlock Mike's Happy Ending
Unlock Tina's Romantic End
Unlock Zaa's Happy Ending
Didn't Save the Girl
Saying Something Stupid