Rock and Coil Hit Back
10
Rock and Coil Hit Back is an achievement in Halo: The Master Chief Collection. It is unlocked by earning 100 Environmentalist medals in Halo 2: Anniversary multiplayer matchmaking. Environmentalist medals are awarded for kills with fusion coils and the stalactites on Lockdown. The achievement is worth 10 gamerpoints.
Achievements in Halo: The Master Chief Collection (list)
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Halo: Combat Evolved Anniversary
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Campaign completion
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Campaign scoring
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Collectibles
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Easter eggs
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Miscellaneous
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Halo 2: Anniversary campaign
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Campaign completion
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Campaign scoring
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Collectibles
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Easter eggs
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Miscellaneous
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Halo 2 Anniversary multiplayer
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BLAST Soda
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Halo 3
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Campaign completion
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Campaign scoring
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Collectibles
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Easter eggs
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Miscellaneous
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Halo 3: ODST
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Campaign completion
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Campaign scoring
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Collectibles
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Easter eggs
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Miscellaneous
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Halo 4
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Campaign completion
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Campaign scoring
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Collectibles
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Easter eggs
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Miscellaneous
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Halo: Reach
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Campaign completion
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Campaign time
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Campaign score
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Collectibles
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Easter eggs
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Miscellaneous
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