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