Here is the full list of all 31 9 Monkeys of Shaolin achievements.
Defeat Fudo.
Finish the game without dying.
Complete all missions.
Fully master the second style.
Collect all weapons.
Collect all items.
Fully master the first style.
Defeat Okina.
Try every type of tea.
Defeat the Kasshiki.
Kill 3 opponents with one strike.
Defeat Hannya.
Kill an enemy in the air without touching the ground.
Kill 50 enemies using Qi energy.
Destroy 30 items by throwing enemies into them.
Defeat Shikami.
Deflect projectiles 30 times.
Learn first skill.
Parry 50 attacks.
Complete the prologue mission.
Finish the game on Warrior difficulty.
Master all styles.
Complete a mission without taking any damage.
The endless cycle of rebirth.
Complete a mission in co-op mode.
Gain more points than another player.
Revive another player.
Finish the game on Legend difficulty.
Fully master the third style.
Pull 5 enemies with one seal.
Running from difficulties won't solve the problem.