Kill one guard.
Save Azai from the mercenaries.
Perform 25 successful stealth kills.
Distract 25 guards using environmental objects.
Use a dead body to lure another guard and then stealth kill them.
Assassinate Kelly, the mercenary captain.
The Worst Allies
Kill a guard by getting other guards to shoot them.
Things Better Left Unseen
Throw the body of one guard to terrorize another.
Complete a level without getting detected.
Perform five different types of stealth kills successfully in one level.
No One Lives Forever
Stealth kill an elite guard after stunning him.
Terrorize 10 guards.
Escape from the Stronghold.
Determine your fate.
Complete a level without killing any guards.
Stealth kill a guard from inside a dumpster.
The Dark Project
Get the Undetected honor bonus 10 times in one level.
Terrify a guard using the result of a hanging stealth kill five times.
Complete a level without killing any guards and without being detected.
Behind the Curtain
View any of the developer commentaries.
Distract 25 guards using your equipment.
Terrify a guard and cause him to stumble to his death.
Tactical Espionage Action
Within a single Focus, aim and throw three different types of items.
Kill a guard from inside the box.
Of The Mind
Complete all of the challenge rooms.
Earn all the Seals in every level.
Well, I Think It's Interesting
Read one of the history lesson developer commentaries.
Descendent of Iga
Earn three stars in every level.
Find all three scrolls in every level.
Days Long Past
Complete the new Special Edition level.
Earn all the upgrades.
Back to Bed With You
Knock out an enemy again that was revived from being knocked out.
Complete the game in New Game Plus.
What Could Have Been
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.
Couldn't Do That Before
Disable a spotlight using the Dusk Moths.
The Humble Moth
Stun an elite guard with moths then dispatch him.