View any of the developer commentaries.
Distract 25 guards using your equipment.
Get the Undetected honor bonus 10 times in one level.
Earn all the upgrades.
Earn three stars in every level.
Find all three scrolls in every level.
Within a single Focus, aim and throw three different types of items.
Earn all the Seals in every level.
Kill a guard from inside the box.
Determine your fate.
Complete all of the challenge rooms.
Escape from the Stronghold.
Assassinate Karajan.
Stealth kill an elite guard after stunning him.
Terrify a guard and cause him to stumble to his death.
Throw the body of one guard to terrorize another.
Complete a level without killing any guards.
Complete a level without killing any guards and without being detected.
Terrify a guard using the result of a hanging stealth kill five times.
Stealth kill a guard from inside a dumpster.
Assassinate Kelly, the mercenary captain.
Kill a guard by getting other guards to shoot them.
Terrorize 10 guards.
Use a dead body to lure another guard and then stealth kill them.
Perform five different types of stealth kills successfully in one level.
Complete a level without getting detected.
Distract 25 guards using environmental objects.
Perform 25 successful stealth kills.
Kill one guard.
Save Azai from the mercenaries.
Complete the game in New Game Plus.
Complete the new Special Edition level.
Stun an elite guard with moths then dispatch him.
Knock out an enemy again that was revived from being knocked out.
Complete one of the original Mark of the Ninja levels using the Path of Wisdom.
Dispatch two enemies at once using a body infected with Toxic Fungus.
Read one of the history lesson developer commentaries.
Disable a spotlight using the Dusk Moths.
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