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