Here is the full list of all 38 Mark of the Ninja: Remastered achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Complete the game in New Game Plus.
Read one of the history lesson developer commentaries.
Complete a level without killing any guards and without being detected.
Determine your fate.
Earn three stars in every level.
Find all three scrolls in every level.
Earn all three seals in every level.
Kill a guard from inside the box.
Earn all of the upgrades.
Complete all of the challenge rooms.
Escape from the Stronghold.
Assassinate Karajan.
Complete a level without killing any guards.
Complete one of the original Mark of the Ninja levels using the Path of Wisdom.
Stealth kill an elite guard after stunning him.
Stun an elite guard with moths then dispatch him.
Terrify a guard and cause him to stumble to his death.
Terrify a guard with a hanging stealth kill five times.
Disable a spotlight using the Dusk Moths.
Stealth kill a guard from inside a dumpster.
Assassinate Kelly, the mercenary captain.
Get the Undetected bonus 10 times in one level.
Perform five different types of stealth kills in one level.
Complete Dosan's Tale.
View any of the developer commentaries.
Use a dead body to lure another guard and then stealth kill him.
Terrorize 10 guards.
Dispatch two enemies at once using a body infected with Toxic Fungus.
Knock out an enemy again that was revived from being knocked out.
Kill a guard by getting other guards to shoot him.
Throw the body of one guard to terrorize another.
Distract 25 guards using your equipment.
Within a single Focus, aim and throw three different types of items.
Distract 25 guards using environmental objects.
Complete a level without getting detected.
Perform 25 successful stealth kills.
Save Azai from the mercenaries.
Kill one guard.