Here is the full list of all 31 Skaramazuzu achievements.
You both live
You activated the Star Orb
You solved the Star Code Key
You got the Juicy Fruit for Kid
You found Flower Seeds for Bird
You activated the Pentagon Orb
You solved the Pentagon Code Key
You got the Ring for Creature
You close up the Grave marked with an X
You looted the Grave marked with an X
You watch Pyro go to sleep
You watered the Flowertree
You acquired Water from the Cave in the Well
You Fixed the Broken Figurine for Nobody
You activated the Square Orb
You solved the Square Code Key
You found a Bone for Mister and Misses
You acquired the Pearls for Ghost
You managed to reach the hidden Pearls
You found fishing bait for Under
You showed the Little Worm to ???
You activated the Triangle Orb
You solved the Triangle Code Key
You found Fire for Dragon
You showed the Old Bucket to ???
You found a way to get into the Well
You can now enter the Graveyard
You managed to get the Report Form Fully Signed
You solved the Strange Disc Fragments puzzle
You solved the Strange Disc puzzle
You turned on both lights