Knuckles the Echidna
|Become friends with Knuckles.|
After you have beaten the Ice Cap stage with Sonic, head toward the waterfall in the Mystic Ruins. There will be a cut-scene where Knuckles is first introduced. He will demand you to give him your chaos emeralds then a boss fight will ensue. Once you defeat Knuckles, Eggman will show up and unleash Chaos 4 on you. Once Chaos 4 is defeated, there will be a cut-scene and afterward Knuckles will become playable. This achievement will unlock after the prompt. This can also be unlocked with Tails!
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