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