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.
Complete a level without killing any guards.
Complete a level without killing any guards and without being detected.
Find all three scrolls in every level.
Earn all three seals in every level.
Kill a guard from inside the box.
Earn three stars in every level.
Earn all of the upgrades.
Determine your fate.
Complete all of the challenge rooms.
Escape from the Stronghold.
Assassinate Karajan.
Distract 25 guards using your equipment.
Within a single Focus, aim and throw three different types of items.
Stun an elite guard with moths then dispatch him.
Stealth kill an elite guard after stunning him.
Stealth kill a guard from inside a dumpster.
Assassinate Kelly, the mercenary captain.
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.
Disable a spotlight using the Dusk Moths.
Read one of the history lesson developer commentaries.
Perform five different types of stealth kills in one level.
Distract 25 guards using environmental objects.
Terrify a guard and cause him to stumble to his death.
Throw the body of one guard to terrorize another.
Get the Undetected bonus 10 times in one level.
Complete a level without getting detected.
Save Azai from the mercenaries.
Perform 25 successful stealth kills.
Complete Dosan's Tale.
Terrorize 10 guards.
Terrify a guard with a hanging stealth kill five times.
Kill a guard by getting other guards to shoot him.
Kill one guard.
Use a dead body to lure another guard and then stealth kill him.
View any of the developer commentaries.
Knock out an enemy again that was revived from being knocked out.