Full list of all 38 Mark of the Ninja achievements worth 500 gamerscore. It takes around 10-12 hours to unlock all of the achievements in the base game.
The base game contains 30 achievements worth 400 Gamerscore, and there is 1 DLC pack containing 8 achievements worth 100 Gamerscore.
Complete the game in New Game Plus.
Earn all the upgrades.
Earn three stars in every level.
Find all three scrolls in every level.
Earn all the Seals in every level.
Distract 25 guards using your equipment.
Complete all of the challenge rooms.
Determine your fate.
Kill a guard from inside the box.
Escape from the Stronghold.
Assassinate Karajan.
Stealth kill an elite guard after stunning him.
Get the Undetected honor bonus 10 times in one level.
Stealth kill a guard from inside a dumpster.
Assassinate Kelly, the mercenary captain.
Perform five different types of stealth kills successfully in one level.
Terrify a guard using the result of a hanging stealth kill five times.
Use a dead body to lure another guard and then stealth kill them.
Terrify a guard and cause him to stumble to his death.
Terrorize 10 guards.
Kill a guard by getting other guards to shoot them.
Within a single Focus, aim and throw three different types of items.
Perform 25 successful stealth kills.
Complete a level without killing any guards and without being detected.
Complete a level without killing any guards.
Complete a level without getting detected.
Distract 25 guards using environmental objects.
Save Azai from the mercenaries.
Throw the body of one guard to terrorize another.
Kill one guard.
Read one of the history lesson developer commentaries.
Disable a spotlight using the Dusk Moths.
Stun an elite guard with moths then dispatch him.
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.
Complete the new Special Edition level.
Knock out an enemy again that was revived from being knocked out.
View any of the developer commentaries.