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