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