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