Here is the full list of all 27 The Cave achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Got everyone out of The Cave without dying once.
Saw the good in everyone.
Collector of forgotten dreams.
Remembered it's wrong to steal.
Slipped, where wet.
Made all three characters smell like a dinosaur at once.
Peered into everyone's fate.
Pantomimed an ancient hieroglyph.
Everyone reached the bottom.
Saw the darkness in all our hearts.
Served as an accessory to the Time Traveler's murder of her enemy's ancestor.
The scale reveals a baleful figure.
Where did the King go anyway?
Saw a postcard stolen from the Gift Shop.
Sacrificed oneself for ultimate flavor.
Food-based destruction.
Played some dubious role in the Monk's murder of his Master.
Broke bridges.
Recorded and played back the elevator music from the Zoo food court.
Stood by and watched as the Twins murdered their parents.
Watched Mummy and Daddy's furniture get broken all to bits.
Came ever-so-close to recovering the Sarcophagus.
3 die by the Miner's hand.
Reached the bottom of The Cave.
Shared in the blame for the Scientist's act of mass murder.
Enabled the Hillbilly to burn down the Carnival.
Helped the Knight obtain Excalibur.