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