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