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