|Become friends with E-102.|
After you complete the Sky Deck stage, take the platform to the ship deck and you will receive a cut-scene and another Boss, E-102. Once he is defeated there will be yet another cut-scene where Sonic decides to spare him for Amy. After the scene is over Gamma will become playable. This achievement will unlock after the prompt. This can also be unlocked with Tails, Knuckles, Amy, and Big!
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