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