Complete the indicated task in the listed level to unlock the corresponding hidden Boss.
Boss | How to unlock
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Gnezdo (Steel Beast) | Get 25 Coup de grace attacks before 80 kills.
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Gnezdo (High Sea Fortress) | Get 40 melee kills before 80 kills.
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Napad (Urban Chaos) | Get 15 Counter Kills before 80 kills.
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Strelat (Mining the Depths) | Kill 70 enemies before 600 seconds.
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Strelat (Catacombs) | Get 20 Quick Shot Kills.
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Ubistvo (Rail Yard) | Get 25 Quick shot kills before 80 kills.
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