| Achievement | How to unlock
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| - 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 from the Stronghold.
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| - Terrify a guard using the result of a hanging stealth kill five times.
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| - Complete a level without killing any guards and without being detected.
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| - Find all three scrolls in every level.
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| - Kill a guard from inside the box.
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- Karajan's Fate (20 points)
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| - Distract 25 guards using your equipment.
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| - Complete a level without getting detected.
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| - 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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| - Complete all of the challenge rooms.
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| - Earn all the Seals in every level.
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| - 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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| - Distract 25 guards using environmental objects.
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| - 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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