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