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