How To Unlock Gold Camo Skins in Call of Duty: Modern Warfare 2

To unlock Gold camo skins in MW 2, you have to complete 4 challenges

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Challenge 1: Get 50 Kills with the M4 - Unlocks the Scales Camo

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Challenge 2: Get 50 Kills while ADS with the M4 - Unlocks the Desert Hybrid Camo

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Challenge 3: Get 10 Double Kills with the M4 - Unlocks the Dark Leaves Camo

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Challenge 4: Get 15 Kills from behind with the M4 - Unlocks the Urban Renewal Camo

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Challenge 5: Get 3 Kills without dying 10 times with the M4 - Unlocks the Gold Camo

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With that done, you can then complete 8 Gold Challenges to unlock Platinum, then 51 Platinum Challenges to unlock Polyatomic, and finally 51 Polyatomic Challenges to unlock the Orion camo.

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