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