| Achievement | How to unlock
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| Awakened (10 points) | Save Azai from the mercenaries.
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| Crimson Haiku (10 points) | Perform five different types of stealth kills successfully in one level.
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| Deadly Shadows (10 points) | Stealth kill a guard from inside a dumpster.
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| Descendent of Iga (15 points) | Earn three stars in every level.
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| Escape (20 points) | Escape from the Stronghold.
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| Fated (40 points) | Determine your fate.
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| Gallows (10 points) | Terrify a guard using the result of a hanging stealth kill five times.
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| Ghost (20 points) | Complete a level without killing any guards and without being detected.
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| Haiku (15 points) | Find all three scrolls in every level.
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| Hisomu's Heir (5 points) | Kill one guard.
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| Inner Heaven (5 points) | Kill a guard from inside the box.
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| Karajan's Fate (20 points) | Assassinate Karajan.
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| Manipulator (5 points) | Distract 25 guards using your equipment.
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| Marked (15 points) | Earn all the upgrades.
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| Masterful (10 points) | Complete a level without getting detected.
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| Mercy (10 points) | Complete a level without killing any guards.
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| No One Lives Forever (10 points) | Stealth kill an elite guard after stunning him.
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| Of The Mind (10 points) | Complete all of the challenge rooms.
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| Oni (10 points) | Terrorize 10 guards.
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| Perfection (15 points) | Earn all the Seals in every level.
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| Snare (10 points) | Use a dead body to lure another guard and then stealth kill them.
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| Stealth Assassin (5 points) | Perform 25 successful stealth kills.
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| Tactical Espionage Action (5 points) | Within a single Focus, aim and throw three different types of items.
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| The Dark Project (10 points) | Get the Undetected honor bonus 10 times in one level.
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| The Mercenary (20 points) | Assassinate Kelly, the mercenary captain.
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| The Worst Allies (10 points) | Kill a guard by getting other guards to shoot them.
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| Things Better Left Unseen (10 points) | Throw the body of one guard to terrorize another.
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| Trickster (5 points) | Distract 25 guards using environmental objects.
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| True Ninja (50 points) | Complete the game in New Game Plus.
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| Unstable Footing (10 points) | Terrify a guard and cause him to stumble to his death.
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