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