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