Here is the full list of all 50 Way of the Samurai 3 (EU/HK/JP/TW) achievements worth 1,000 gamerscore.
Mastered all skills for thirty weapons.
Mastered all skills of Ninja Dual Sword Stance.
Mastered all skills of Dual Sword Stance.
Achieved 100 Chain Kills.
Cleared game with more than 120% Samurai Rating.
Cleared the game in Hard difficulty.
Obtained 20 titles.
Completed and discovered all Endings.
Learned a total of 100 skills.
Mastered all skills of Bare Hands Stance.
Obtained 50 different weapons.
Completed and discovered 5 Endings.
Cleared the game in Instant Kill difficulty.
Completed 50 jobs successfully.
Completed and discovered the True Ending.
Played more than 10 hours.
Defeated Shuzen Fujimori.
Mastered all skills for a weapon.
Achieved 10 Chain Kills.
Total Samurai Points exceeded 10000 points.
Obtained all Outfits.
Killed an enemy using a weapon with zero durability.
Defeated an enemy with Blunt Attack using a weapon with zero durability.
Defeated Sensei at the Dojo.
Cleared the game in Easy difficulty.
Broke an opponent's weapon.
Learned a total of 10 skills.
Obtained 5 titles.
Completed the game.
Cleared the game in Normal difficulty.
Obtained all Heads.
Total Samurai Points exceeded 2000 points.
Obtained 10 different weapons.
Created a weapon.
Obtained a partner.
Forged a weapon for the first time.
Obtained an extra Sword Safe.
Total Samurai Points exceeded 200 points.
Fist time killing an enemy.
Completed a job successfully.
Defeated an opponent with a Blunt Attack.
Learned a skill for the first time.
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 Draw Stance.
Mastered all skills of Ninja Stance.