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