Here is the full list of all 16 Midnight Mysteries 4: Haunted Houdini achievements.
Find every hidden object in all Unlimited HO Mode scenes.
Complete the bonus chapter.
Find all 100 padlocks, handcuffs, keys and straightjackets in "Escape Artist Hunt."
Solve all the puzzles in Story Mode.
Complete Story Mode.
Complete Story Mode without using any hints.
Complete Story Mode with no Black Cat scares.
Unlock Unlimited Hidden Object Mode.
Find all the ESP cards in the garden in one try.
Conjure a pigeon.
Get into Houdini's house without a hint.
Complete each HOG in Story Mode without the lantern.
Escape from Houdini's coffin in one try.
Complete a hidden object scene in less than a minute.
Collect all 70 clovers in Story Mode.
Collect all 52 ravens in Story Mode.