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