Here is the full list of all 24 OtherSide Of Mist And Mountain Demo achievements.
Complete the first train exploration
Witness the Mysterious Disappearance of Genyu
Choose to stay on the train
Purchase Zhenyu's phone
Successfully evade the pursuit of the Floating Spirit in the non-existent district
Hang the first sign of the office
Complete the first chapter
End your life in the prison cell
Complete the second chapter
Complete all puzzles within ten minutes
Play the lock-picking game for more than 30 seconds
Don't look at things you shouldn't
Quietly suffocate to death
Killed by Saki
Hesitate and miss the clue
Carelessly startle the snake
Ritual failure, you die
Successfully complete all branching options without errors
Complete the third chapter
Lose health by being touched by a ghost and die
Successfully solve 1 museum puzzle
Complete the fourth chapter
Complete the chapter about Zhenyu's childhood memories
Accidentally die from electric shock