Here is the full list of all 36 The Invisible Hours achievements.
Watch all the scenes in chapter 4
Listen to the lullaby
Find all the newspapers clips
Go to the hotel room
Use the Spirit Radio
Watch Mundy's death
Collect all the clues
Find the fox
Find all of Tesla's diaries
Discover who killed Tesla
Travel back in time with Flora
Watch Gustav's fall
Watch Gustav for the entire game
Watch all the scenes in chapter 3
Find all the letters from the guests
Watch Vanderberg's murder
Watch all the scenes in chapter 2
Watch Bernhardt and Mundy recite Shakespeare
Try to bang the gong
Find Edison's food bowl
Find Lafcadio Boone's mask
Look through the telescope
Watch all the scenes in chapter 1
Find old photos of all the characters
Find the secret workshop in the basement
Explore the entire Island
Watch Bernhardt putting on makeup
Watch Edison play chess
Find the library receipt
Find Deadlight logo
Activate Following mode
Find the hats
Find the Ulysses poem
Find the first Tesla Diary
Find the chemistry notes
Be walked through by a character