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