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