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