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