Here is the full list of all 32 When the Darkness comes achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Find all the clocks in the School level.
Discover the secret room.
Progress in the Metro.
Find the Light at the end of the Bridge.
Try to escape from the platform.
Try to exit the game by conventional means.
You won the game!
Wait a long time for that first red door.
Wait a long time before pressing the first button.
Try to escape in the City.
Try to find meaning where there is none.
Successfully reach the end of the platforms.
Go behind the Hermitage.
Find the Speed Ninja easter egg.
Run away from your fears.
Choose Fame as your purpose in life.
Choose Money as your purpose in life.
Choose Happiness as your purpose in life.
Choose Knowledge as your purpose in life.
Choose Creation as your purpose in life.
Select no purpose in life.
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Survive the first run.
Relaunch the game after the first run.
Discover the Sunny City.
Get a different answer.
Discover the Sunny School.
Reach the end of the second run.
Find your light.
You have reached the end of the journey.
Discover the Sunny Factory.
Put the ball in the goal.