Mark of the Ninja

Stealth Assassin

Perform 25 successful stealth kills.

Crimson Haiku

Perform five different types of stealth kills successfully in one level.

Inner Heaven

Kill a guard from inside the box.

The Dark Project

Get the Undetected honor bonus 10 times in one level.

Things Better Left Unseen

Throw the body of one guard to terrorize another.

Tactical Espionage Action

Within a single Focus, aim and throw three different types of items.

No One Lives Forever

Stealth kill an elite guard after stunning him.

Deadly Shadows

Stealth kill a guard from inside a dumpster.

The Worst Allies

Kill a guard by getting other guards to shoot them.

Unstable Footing

Terrify a guard and cause him to stumble to his death.

Gallows

Terrify a guard using the result of a hanging stealth kill five times.

Snare

Use a dead body to lure another guard and then stealth kill them.

Days Long Past

Complete the new Special Edition level.

The Humble Moth

Stun an elite guard with moths then dispatch him.

Behind the Curtain

View any of the developer commentaries.

Back to Bed With You

Knock out an enemy again that was revived from being knocked out.

What Could Have Been

Complete one of the original Mark of the Ninja levels using the Path of Wisdom.

Cordyceps

Dispatch two enemies at once using a body infected with Toxic Fungus.

Well, I Think It's Interesting

Read one of the history lesson developer commentaries.

Couldn't Do That Before

Disable a spotlight using the Dusk Moths.