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