Here is the full list of all 44 SONG OF HORROR COMPLETE EDITION achievements.
René has found Isaac Färber (M.R. James or higher difficulty).
Erica has found her father (M.R. James or higher difficulty).
Complete the game on H.P. Lovecraft difficulty.
Complete the game, without losing any characters and choosing Daniel whenever he is available, on Edgar Allan Poe or higher difficulty.
Complete the game, without losing any characters, on Edgar Allan Poe or higher difficulty.
Grace has survived The Great Library (M.R. James or higher difficulty).
Omar has survived The Great Library (M.R. James or higher difficulty).
Discover Sebastian P. Husher's whereabouts, without losing any characters, on Edgar Allan Poe or higher difficulty.
Find Isaac Färber, without losing any characters, on Edgar Allan Poe or higher difficulty.
Finish an episode (in which there is more than one character) playing exclusively as Daniel (M.R. James or higher difficulty).
Find Daniel at the Husher Mansion, without losing any characters, on Edgar Allan Poe or higher difficulty.
Sophie has found Daniel and saved his life (M.R. James or higher difficulty).
Alexander has returned to the Husher Mansion, but he didn't find the person he was expecting (M.R. James or higher difficulty).
Etienne has found Daniel and saved his life (M.R. James or higher difficulty).
You have witnessed the end of Daniel's story.
You have left the music box where it belongs.
Discover the truth about Ariadne.
Find all of Ariadne's Lost Drawings.
Discover what to do with the music box, without losing any characters, on Edgar Allan Poe or higher difficulty.
You have completed Berenice's third dream.
You have discovered what to do with the music box.
Lidia discovered what to do with the music box (M.R. James or higher difficulty).
You have completed Berenice's second dream.
Find three ominous references to ancient times.
You have completed Berenice's first dream.
Ernest paved the way for Daniel to find Sebastian P. Husher (M.R. James or higher difficulty).
Find Sebastian P. Husher, without losing any characters, on Edgar Allan Poe or higher difficulty.
You have found Sebastian P. Husher and lived to tell the tale.
Complete the Tarot Deck.
Learn how to stand your ground against The Requiem.
Sebastian P. Husher, in the cell, with the mirror.
You have discovered Sebastian P. Husher's whereabouts.
Find Maxwell's Lucky Coin.
Learn how to escape The Abyss.
You have found Isaac Färber and his music box.
Find Coltar's Wisdom Tooth.
Learn how to survive The Silence.
You have rescued Daniel from the Husher Mansion.
Alina has entered the Husher Mansion and gone above and beyond the call of duty (M.R. James or higher difficulty).
Pick up a gift from a character you previously lost (M.R. James or higher difficulty).
Complete the Husher Haiku Collection.
Learn how to resist The Darkness.
Learn how to block The Door.
Daniel has become trapped in the Husher Mansion... or elsewhere.