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