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