No missable achievements (plus 29 unknown)
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Finish Act One.
Find the memories of an old experiment.
Show off your festive side.
Find a past project.
Finish Act One's Nightmare.
Finish Act Two.
Finish Act Two's Nightmare.
Leave on all the lights before sleeping.
Finish all four mazes without getting caught.
Finish Act Three.
Finish Act Three's Nightmare.
Eat all the cupcakes.
Finish the graveyard puzzle in ten moves or less.
Play the first bar of 'Counting Sheep'.
Visit all the side dreams.
Find the mess on floor one.
Collect all the Dream bible pages.