Full list of all 48 Killer is Dead - Nightmare Edition achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Cleared all challenge missions.
All achievements completed
Cleared all episodes on Normal Mode.
Ranked AAA executioner on 44 missions.
Cleared all episodes on Very Hard Mode.
Unlocked all challenge missions.
Gave a present 50 times or more.
Collected all female costumes.
Received 20 rewards from the beauties.
Have a total of $100 million in cash.
Ranked AAA executioner on 24 missions.
Changed costume to Ulti-mondo.
Ranked AAA executioner on 12 missions.
Made Scarlett your prisoner in body and soul.
Increased all sub-weapons to maximum upgrade level.
Cleared 12 challenge missions.
Killed 100 enemies using the "Head Shot."
Cleared all sub-missions.
Made Koharu your prisoner in body and soul.
Increased HEALTH to maximum upgrade level.
Increased BLOOD to maximum upgrade level.
Unlocked 12 challenge missions.
Increased all Attack and Special skills.
Made Natalia your prisoner in body and soul.
Completed Episode 12.
Cleared all episodes on Hard Mode.
Cleared all missions.
Completed Episode 11.
Cleared 6 challenge missions.
Got revived by Mika 20 times.
Cleared 6 sub-missions.
Completed Episode 10.
Sliced an enemy upward and finished it in the air.
Cleared 3 sub-missions.
Killed an enemy using the "Burst Rush."
Unlocked 6 challenge missions.
Completed Episode 9.
Completed Episode 8.
Completed Episode 7.
Completed Episode 6.
Completed Episode 5.
Killed an enemy with an enemy attack.
Completed Episode 4.
Completed Episode 3.
Completed Episode 2.
Completed Episode 1.