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