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.
Broke bridges.
Collector of forgotten dreams.
Saw the good in everyone.
Pantomimed an ancient hieroglyph.
Food-based destruction.
Where did the King go anyway?
Everyone reached the bottom.
Saw the darkness in all our hearts.
Slipped, where wet.
Served as an accessory to the Time Traveler's murder of her enemy's ancestor.
Made all three characters smell like a dinosaur at once.
Sacrificed oneself for ultimate flavor.
Remembered it's wrong to steal.
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.
Enabled the Hillbilly to burn down the Carnival.
Saw a postcard stolen from the Gift Shop.
Reached the bottom of The Cave.
Played some dubious role in the Monk's murder of his Master.
Shared in the blame for the Scientist's act of mass murder.
Helped the Knight obtain Excalibur.
Got everyone out of The Cave without dying once.
The scale reveals a baleful figure.
Peered into everyone's fate.