Here is the full list of all 38 SAMURAI MAIDEN achievements.
Used a Decoy.
Defeated Shingen Takeda.
Defeated Kenshin Uesugi.
Used a Bomb.
Activated Komimi's Ninjutsu.
Used a Mine.
Activated Hagane's Ninjutsu.
Enhanced a weapon for the first time.
Unlocked a memory in the Album.
Used a Recovery Potion.
Activated Hagane's Ninja Skill 1, Lightning Fist.
Activated Iyo's Ninja Skill 1, Tsubame Fireworks.
Activated Komimi's Ninja Skill 1, Ice Smash.
Used a Timed Bomb.
Activated Iyo's Ninjutsu.
Defeated a total of 1,000 enemies.
Defeated a total of 5,000 enemies.
Defeated a total of 15,000 enemies.
Acquired all trophies.
Achieved S on all battlefields across all difficulty levels.
Cleared the Main Story on Normal mode.
Cleared the Main Story on Hard mode.
Cleared the Main Story on Demonic mode.
Cleared all of Iyo's Bubble Pockets on Normal mode.
Cleared all of Hagane's Bubble Pockets on Normal mode.
Cleared all of Komimi's Bubble Pockets on Normal mode.
Enhanced all of Tsumugi's weapons to the max level.
Enhanced all of Iyo's weapons to the max level.
Enhanced all of Hagane's weapons to the max level.
Enhanced all of Komimi's weapons to the max level.
Unlocked all memories of Iyo.
Unlocked all memories of Hagane.
Unlocked all memories of Komimi.
Collected all memory fragments.
Performed Devoted Heart with Iyo.
Performed Devoted Heart with Hagane.
Performed Devoted Heart with Komimi.
Defeated the Demon Lord.