Kill an Enemy While Playing as an Alternate Character Costume Other Than Drake

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Kill 50 Enemies by Melee-Attacking from Behind

Kill 30 Enemies with the M9

Find 80 Treasures

Kill 5 Enemies in a Row with Headshots

Throw Back a Grenade and Defeat 2 Enemies at Once

Kill 30 Enemies with the KAL-7

Kill 20 Enemies with Gunfire While Hanging

Defeat 20 Enemies While Swimming

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Kill an Enemy While Playing as an Alternate Character Costume Other Than Drake