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.
Find the juice box.
Find the heart-shaped key.
Find the dead cat.
Find the paint bucket.
Help the pianist.
Find the bus card.
Shrink the eye.
Find the shell necklace.
Find the bullet.
Touch the moon bunny.
Find Blockhead.
Discover the ancient aliens.
Find the pill.
Find the magnifying glass.
Find the ID card.
Find the glasses.
Find the compass.
Find the bag of seeds.
Find the hat.
Find the umbrella.