The Special Edition DLC Add-on for Mark of the Ninja has 8 achievements.
Read one of the history lesson developer commentaries.
Knock out an enemy again that was revived from being knocked out.
Stun an elite guard with moths then dispatch him.
Dispatch two enemies at once using a body infected with Toxic Fungus.
Complete one of the original Mark of the Ninja levels using the Path of Wisdom.
Disable a spotlight using the Dusk Moths.
Complete the new Special Edition level.
View any of the developer commentaries.