Here is the full list of all 19 Silence Channel achievements.
Find the secret ending of the game
Complete the first ending of the game
Read every notes in the game
Solve Final puzzle in the game
Child's painting
Solve the puzzle box at the Bedroom
Painting brush
Find the digital password
Enter the limbo
Unlock the basement door
Solve the puzzle box at the Basement
Familiar picture
Solve the puzzle box at the Mansion
Unknown picture
Sarah's Hat
Hunted Doll
Cover of J.Spinners notebook
Julie's grave
First Note