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