Here is the full list of all 22 Dreaming Sarah achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Finish the game.
Find the watch.
Shrink the eye.
Help the pianist.
Find the bus card.
Discover the ancient aliens.
Find the juice box.
Find the bullet.
Find the dead cat.
Find the heart-shaped key.
Find the shell necklace.
Find the pill.
Find the ID card.
Find the glasses.
Find Blockhead.
Find the paint bucket.
Touch the moon bunny.
Find the magnifying glass.
Find the compass.
Find the bag of seeds.
Find the hat.
Find the umbrella.