Here is the full list of all 14 Sylvio trophies - there are 11 bronze, 2 silver and 1 gold.
Found all voices in the static.
Found the museum on the top of Yellow Mountain.
You found all hidden messages and collected all the pieces of shredded piano sheets.
You found a hole in the ground, lit up by lights switched on in the terrarium.
Found all of Bobby's Reels.
You collected the keys from all drifting parade balloon corpses.
You shot the crow on the top of the amusement ride.
You found a secret code for the signal lamp. Somewhere, a pump started.
You found a secret code for the signal lamp.
Played the piano in the auditorium.
Found 5 hidden messages.
Heard 5 voices in the static.
Tried the entertainment system in the restaurant.