Complete the indicated task to unlock the corresponding concept art.
Art | How to unlock
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Concept Art #1: Get 100 shank kills.
Concept Art #2: Get 100 kills with the chains.
Concept Art #3: Get 100 kills with dual pistols.
Concept Art #4: Get 100 kills with the katana.
Concept Art #5: Get 100 kills with grenades.
Concept Art #6: Get 100 kills with the Uzi.