Here is the full list of all 50 Way of the Samurai 3 achievements.
Completed and discovered 5 Endings.
Cleared the game in Instant Kill difficulty.
Cleared game with more than 120% Samurai Rating.
Defeated Shuzen Fujimori.
Cleared the game in Easy difficulty.
Defeated Sensei at the Dojo.
Played more than 10 hours.
Obtained 5 titles.
Mastered all skills for a weapon.
Completed the game.
Cleared the game in Normal difficulty.
Obtained all Heads.
Total Samurai Points exceeded 2000 points.
Achieved 10 Chain Kills.
Created a weapon.
Obtained a partner.
Obtained 10 different weapons.
Learned a total of 10 skills.
Obtained an extra Sword Safe.
Total Samurai Points exceeded 200 points.
Defeated an opponent with a Blunt Attack.
Broke an opponent's weapon.
Forged a weapon for the first time.
Learned a skill for the first time.
Completed a job successfully.
First time killing an enemy.
Completed and discovered the True Ending.
Completed and discovered all Endings.
Cleared the game in Hard difficulty.
Mastered all skills of Upper Stance.
Mastered all skills of Middle Stance.
Mastered all skills of Lower Stance.
Mastered all skills of Single Stance.
Mastered all skills of Side Stance.
Mastered all skills of Spear Stance.
Mastered all skills of Bare Hands Stance.
Mastered all skills of Draw Stance.
Mastered all skills of Ninja Stance.
Mastered all skills of Dual Sword Stance.
Mastered all skills of Ninja Dual Sword Stance.
Mastered all skills for thirty weapons.
Achieved 100 Chain Kills.
Obtained all Outfits.
Learned a total of 100 skills.
Obtained 50 different weapons.
Completed 50 jobs successfully.
Obtained 20 titles.
Killed an enemy using a weapon with zero durability.
Defeated an enemy with Blunt Attack using a weapon with zero durability.
Total Samurai Points exceeded 10000 points.