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