Here is the full list of all 42 DreadOut achievements.
Playing DreadOut on Thursday night
Playing DreadOut without any clues
Finished the game without entering Limbo in Act 1
Took a picture of Betsy
Finished DreadOut
Playing DreadOut with convenience
Thank You
Endured all the scary moments on DreadOut so far
Reached an alternate ending
Collected all ghost pictures
Found the secret of the mansion
It's a cute way to die
:P~
Took a picture of Gundul Pringis
Took a picture of Palasik
Deal with Suzzie
Dial the correct number
Solved the mistery of the crying widow
Collected all articles
Listen to her story
Resistance is futile against the hand of fate
Banish many Pocongs in single shot
Solved graveyard puzzle
Acquired the Camera
Solved all puzzles
Left the school
Defeated the school principal's ghost
Collected all special items
Took a picture of Sundel Bolong at the school cafeteria
Solved a puzzle
Took a picture of the cat
Trapped alone
Took a picture of Pocong on a motorcycle
Took a picture of Genderuwo
Took a picture of UFOs
Found an article
Took a picture of Shakira Irawati
Stay scanning for ghosts
Entered Limbo
Added any picture to the gallery
Travelled for a long distance
Took a picture of a ghost