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