| Achievement | How to unlock
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| - Story: Find and shoot all the hidden objects in the game.
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| - Arcade: Beat the 2,100,000 point score at the end of level 2, on Crazytrain.
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| - Arcade: Get the "All enemies killed" bonus at the end of each level, on any difficulty setting.
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| - Story: Kill Bloodshot avoiding all his melee attacks and slapping his face everytime you can.
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| - Arcade: Get an S ranking at the end of level 4, on any difficulty setting.
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| - Story: Complete the last level in Crazytrain difficulty.
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| - Arcade: Beat a fast-forward time of 1 min 05 sec in level 6, on Normal.
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| - Arcade: Get an S ranking at the end of level 1, on any difficulty setting.
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| - Story: Kill 20 enemies with a chihuahua on your leg.
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| - Story: Complete the first level.
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| - Arcade: Perfom 500 headshots in Slomo.
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| - Arcade: Get an S ranking at the end of level 7, on any difficulty setting.
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| - Arcade: Get the golden AK-47 once in all levels, on Abnormal.
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| - Arcade: Get an S ranking at the end of level 5, on any difficulty setting.
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| - Story: Perform 3,000 headshots.
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| - Story: Kill the screaming enemy on all levels.
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| - Arcade: Kill 25 enemies in one game while in Slomo in level 5, on Abnormal.
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| - Story: Complete the last level.
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| - Story: Perform 200 nutshots.
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| - Story: Kill Teniu the Grave, dodging all the crates.
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| - Story: Kill Kim Bong Sik, without getting hit by his projectiles.
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| - Arcade: Accumulate 10 minutes of fast-forward.
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| - Arcade: Get an S ranking at the end of level 2, on any difficulty setting.
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| - Arcade: Get an S ranking at the end of level 3, on any difficulty setting.
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| - Arcade: Get an S ranking at the end of level 6, on any difficulty setting.
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| - Story: Get a 4 Star global ranking at the end of all levels.
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