Here is the full list of all 29 Dream achievements.
Finish the graveyard puzzle in ten moves or less.
Finish all four mazes without getting caught.
Collect all the Dream bible pages.
Find the mess on floor one.
Visit all the side dreams.
Play the first bar of 'Counting Sheep'.
Finish Act Three's Nightmare.
Finish Act Three.
Finish Act Two.
Finish Act Two's Nightmare.
Eat all the cupcakes.
Leave on all the lights before sleeping.
Finish Act One's Nightmare.
Finish Act One.
Find the memories of an old experiment.
Find a past project.
Show off your festive side.
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