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