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