Here is the full list of all 27 The Cave achievements worth 400 gamerscore. It takes around 12-15 hours to unlock all of the achievements on Xbox 360.
Shared in the blame for the Scientist's act of mass murder.
Served as an accessory to the Time Traveler's murder of her enemy's ancestor.
Came ever-so-close to recovering the Sarcophagus.
Reached the bottom of The Cave.
Saw every Can of Corn in The Cave destroyed.
Stood by and watched as the Twins murdered their parents.
Watched Mummy and Daddy's furniture get broken all to bits.
Enabled the Hillbilly to burn down the Carnival.
Helped the Knight obtain Excalibur.
Nobody died.
Stole.
Remembered it's wrong to steal.
Everyone reached the bottom.
Saw the good in everyone.
Saw the darkness in all our hearts.
Collector of forgotten dreams.
Sacrificed oneself for ultimate flavor.
Where did the King go anyway?
The scale reveals a baleful figure.
3 die by the Miner's hand.
Pantomimed an ancient hieroglyph.
Everyone is gross.
Captured crusty melodies.
Slipped, where wet.
Broke bridges.
Peered into everyone's fate.
Murdered your master.