Full list of all 38 Mark of the Ninja achievements. It takes around 20-25 hours to unlock all of the achievements in the base game on Windows.
The base game contains 30 achievements, and there is 1 DLC pack containing 8 achievements.
Kill a guard from inside the box.
Assassinate Karajan.
Escape from the Stronghold.
Determine your fate.
Complete the game in New Game Plus.
Earn all the Seals in every level.
Complete a level without killing any guards.
Complete a level without killing any guards and without being detected.
Stealth kill an elite guard after stunning him.
Stealth kill a guard from inside a dumpster.
Terrify a guard using the result of a hanging stealth kill five times.
Terrorize 10 guards.
Complete a level without getting detected.
Assassinate Kelly, the mercenary captain.
Perform five different types of stealth kills successfully in one level.
Kill a guard by getting other guards to shoot them.
Throw the body of one guard to terrorize another.
Use a dead body to lure another guard and then stealth kill them.
Kill one guard.
Save Azai from the mercenaries.
Distract 25 guards using environmental objects.
Perform 25 successful stealth kills.
Earn three stars in every level.
Find all three scrolls in every level.
Earn all the upgrades.
Complete all of the challenge rooms.
Distract 25 guards using your equipment.
Get the Undetected honor bonus 10 times in one level.
Within a single Focus, aim and throw three different types of items.
Terrify a guard and cause him to stumble to his death.
Complete the new Special Edition level.
Stun an elite guard with moths then dispatch him.
View any of the developer commentaries.
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.