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