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 bus card.
Find the shell necklace.
Find Blockhead.
Help the pianist.
Find the bullet.
Touch the moon bunny.
Find the juice box.
Find the pill.
Shrink the eye.
Discover the ancient aliens.
Find the ID card.
Find the dead cat.
Find the heart-shaped key.
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.