Here is the full list of all 46 BLADESTORM: Nightmare achievements.
Successfully achieved an S rank in battle.
Successfully performed a concerted army attack.
Successfully created an army.
Captured 2 bases within 15 seconds.
Captured all bases other than entry points in the Hundred Years' War scenario.
Successfully achieved 1000 combos.
Captured 8 bases in 1 day in the Hundred Years' War scenario.
Defeated 100 enemy without being attacked successfully.
Successfully captured an enemy Citadel Base.
Successfully achieved a Bladestorm.
Successfully created an original mercenary.
Obtained all achivements.
Unlocked all viewable movies in the Gallery.
Cleared the 100 Years War scenario.
Completed Diary in the 100 Years War scenario.
Cleared Chapter 9 in the Nightmare scenario.
Completed all Diary Rumors in the Hundred Years' War scenario.
Unlocked all usable characters in the Nightmare scenario.
Unlocked all usable characters in the Hundred Years' War scenario.
Unlocked 15 useable characters in the Hundred Years' War scenario.
Completely filled the Diary's Story section in the Hundred Years' War scenario.
Obtained all equipment for males.
Obtained all equipment for females.
Raised 1 Book level to 99.
Obtained all Books.
Successfully obtained a Book allowing you to control monsters.
Used banners 500 times.
Summoned a hired squad 500 times.
Initiated an attack with an army of over 200 soldiers.
Able to attack with 4 squad leaders.
Successfully shot down a flying monster.
Cleared chapter 1 in the Nightmare scenario.
Cleared chapter 2 in the Nightmare scenario.
Cleared chapter 3 in the Nightmare scenario.
Cleared chapter 4 in the Nightmare scenario.
Cleared chapter 5 in the Nightmare scenario.
Cleared chapter 6 in the Nightmare scenario.
Cleared chapter 7 in the Nightmare scenario.
Cleared chapter 8 in the Nightmare scenario.
Unlocked 5 characters with special unlock conditions in the Nightmare scenario.
Defeated 5000 total enemies while leading a squad of monsters.
Obtained S rank in all battles.
Created 10 original mercenaries.
Received a total of over 500,000D.
Obtained an S rank in all Story battles in the 100 Years' War scenario.
Obtained an S rank in all battles in the Nightmare scenario.