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