Here is the full list of all 42 DreadOut achievements.
Playing DreadOut without any clues
Finished the game without entering Limbo in Act 1
Playing DreadOut on Thursday night
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
Took a picture of Betsy
Collected all special items
Added any picture to the gallery
Took a picture of Genderuwo
Stay scanning for ghosts
Took a picture of Pocong on a motorcycle
Took a picture of UFOs
Solved all puzzles
Left the school
Defeated the school principal's ghost
Took a picture of Sundel Bolong at the school cafeteria
Took a picture of the cat
Solved a puzzle
Trapped alone
Found an article
Took a picture of Shakira Irawati
Entered Limbo
Travelled for a long distance
Took a picture of a ghost