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