Here is the full list of all 35 Silence Channel 2 achievements.
Find the first secret clock
Find the second secret clock
Find the third secret clock
Find the 4th secret clock
Find the 5th secret clock
Find the 6th secret clock
Find the 7th secret clock
Find the 8th secret clock
Find the 9th secret clock
Find the 10th secret clock
Find the 11th secret clock
Find the 12th secret clock
Find the 13th secret clock
Find the 14th secret clock
Find the 15th secret clock
Find the 16th secret clock
Find the 17th secret clock
Find the 18th secret clock
Open the basement
Find the missing teddy
Pick up the weapon
Find the exit card
Complete the prologue chapter like a pro player
Complete the chapter one like a pro player
Complete the chapter two like a pro player
Complete the chapter three like a pro player
Find the first letter
Find the second letter
Find the third letter
Complete the storyline
Find the 19th secret clock
Find the 20th secret clock
Find the fourth letter
Find the fifth letter
Find the sixth letter