Desert Runner - 15G (Original Achievement)
Difficulty: 4/10
Sandopolis is the 3rd Zone in the game and this achievement can be obtained while playing as Sonic or Knuckles. The boss is a Sphinx like statue that will appear on the right side of the large room and will crawl towards you slowly. It can fire lasers too so obviously dodge them. To deal damage, simply jump on the Sphinx's paws and then jump up and hit its face, This will reveal Robotnik underneath and allow you to hit him.