No missable achievements (plus 38 unknown)
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Acquire the key to the door in the first dream.
Finish the first dream sequence.
Persuade Henry to sell the book.
Find the stone building in the forest glade.
Underline Arkhamend in the letter that Loath Nolder left.
Solve the jigsaw puzzle in the old stone building.
Solve the recollections of the past book puzzle.
Open the small trapdoor which holds the key to the underground galleries of the old stone building.
Solve the disc puzzle in the elevator.
Prepare the mixture for the dangerous insects.
Find the protective suit.
Find the Homunculus experiment.
Summon Wolfgang Schneider from beyond
Enter the Mansion cellar.
Finish the childhood dream sequence in the Loried mansion.
Retrieve the whereabouts of the mansion named The Gate.
Find the concealed compartment in the floor of Nathanael’s room.
Discover your father’s coffin in the tomb.
Speak with Loath Nolder.
Retrieve the second part of the key, from the nursing home.
Find the Dead Reporter Secret.
Retrieve the third part of the key, from grandma’s room.
Discover Henry's dead wife.
Solve the steam puzzle in the elevator.
Use the last puzzle piece on the door beneath the well.
It is good to have enough flashlights.
Choose the good ending.
Find the book of Darkness Within 1 along with a Lovecraft book in the mansion.
Doom and Gloom