Here is the full list of all 46 Silence achievements. It takes around 8-10 hours to unlock all of the achievements on Windows.
You finished chapter two
Completed the prayer mill story with the death wheel
Completed the prayer mill story with the dream wheel
Completed the prayer mill story with the life wheel
Find all possible Spot interactions
Let spot fly
Let Renie and Noah both pop the bubble
Find all bugs
Hit Kyra
Look into the abyss
Spot plunges everywhere
Burn the swamp
Taste the everything in the swamp
Let the fish get the berries 3 times
Lick the mushrooms until you pass out
You finished chapter one
Let the mushroom fart ten times
Pull the world worm's tooth
Drop the Noiseball
Don't prime the bomb
Prime the bomb
Fix the bomb without letting go
Fall in all balance checks or fall in the same check 3 times
Play with the shadows
Finish the game without dying
Let Sadwick die every time it's possible
You finished chapter three
Go through the mirror
Stay in Silence
Finish the game without using the snoopkey
Finish the game without skipping a text
Spot licked everything
Trigger the same game over sequence twice in a row
Shoot the gate
Send Spot to Kyra
Use the magic boxes to change into all available Spot forms
Discover every possible Spot form
Kick everything possible
Balance without falling down
Listen to Kyra
Dive through the clouds
Get to the gate in 8 steps
Place candles everywhere possible
Sneeze over the candle
Grab 10 gold from the well
Skip every puzzle