Here is the full list of all 47 Silence trophies - there are 30 bronze, 14 silver, 2 gold and 1 platinum.
Obtain all the trophies
Finish the game without using the snoopkey
Spot licked everything
Let Spot fly
Find all possible Spot interactions
Spot plunges everywhere
Stay in Silence
Shoot the gate
Kick everything possible.
Skip every puzzle
Fail three times in balance checks.
Balance without falling down.
Listen to Kyra
Place candles everywhere possible
Get to the gate in 8 steps
Completed the prayer mill story with the death wheel
Completed the prayer mill story with the dream wheel
Let Sadwick die every time it´s possible
Find all bugs
Hit Kyra
Let the fish get the berries 3 times
Taste the everything in the swamp
Don´t prime the bomb
Let the mushroom fart ten times
Trigger the same game over sequence twice in a row
Finish the game without skipping a text
Finish the game without dying
Go through the mirror
You finished chapter three
Dive through the clouds
Send Spot to Kyra
Use the magic boxes to change into all available Spot forms
Grab 10 gold from the well
Discover every possible Spot form
Sneeze over the candle
You finished chapter two
Completed the prayer mill story with the life wheel
Let Renie and Noah both pop the bubble
Look into the abyss
Burn the swamp
Lick the mushrooms until you pass out
You finished chapter one
Pull the world worm's tooth
Drop the Noiseball
Prime the bomb
Fix the bomb without letting go
Play with the shadows.