Here is the full list of all 50 Sylvio achievements.
Communicated with guard at the zoo entrance.
Communicated with Roger's lover in the hotel bathroom.
Game finished with all piano sheets complete.
Looks like an exhibition of cave paintings.
Found all shreds of piano sheet three.
Found all shreds of piano sheet five.
Found all shreds of piano sheet one.
Found all shreds of piano sheet four.
Found all shreds of piano sheet two.
Found all of Bobby's reels.
Blinked a combination, and the pump started.
Blinked a hidden combination on the signal lamp.
All notes and recordings found in the surroundings of the hotel.
Notes from the static : All found
Retrieved the hotel key from corpse hanging from giant balloon.
All notes and recordings found in the surroundings of the zoo.
Shot the crow by the hotel rides.
All notes and recordings found in the surroundings of the ice cream hut.
All notes and recordings found in the surroundings of the big house.
All notes and recordings found in the main park of Saginaw.
Found arcade game no. 2
Found arcade game no. 1
Found all hidden messages
Found 100 hidden messages
Found 60 hidden messages
Found 25 hidden messages
Notes from the static : 60 found
Found 10 hidden messages
Found one hidden message
Found arcade game no. 4
Notes from the static : 40 found
Communicated with Robin in various places of Saginaw main park.
All notes and recordings found in the surroundings of the funfair.
Communicated with Susie on the funfair.
Communicated with Kristoph in the trailer by the big house.
Notes from the static : 20 found
Communicated with unknown by the ice cream hut.
Found arcade game no. 3
All notes and recordings found in the cellar.
Notes from the static : 10 found
Communicated with Daniel in the cellar.
Played the piano in the auditorium.
Notes from the static : 1 found
Used the entertainment system in the restaurant.