Here is the full list of all 44 Shadow Tactics: Blades of the Shogun - there are Aiko's Choice achievements.
Find all hidden caves in Hana Gakuen.
Kill Lady Chiyo without getting a disguise.
Collect 17 badges.
Don't kill anyone with Takuma during the mission “The Best Laid Plans.”
Don't extinguish any light sources in Matsuyama.
Listen to everything Kuma has to say.
Kill all enemies at the mansion in Nagoya.
Finish all missions.
Finish “The Secrets of Hana Gakuen”.
Kill Lady Chiyo with any character other than Aiko.
Distract 4 guards at the same time with Kuma.
Kill a samurai with a rock.
Use Aiko's disguise 15 times.
Kill 30 guards with the help of the environment.
Kill 10 guards with Takuma's Sniper Rifle that are farther than 25 meters away from him.
Kill 3 Samurai with Yuki.
Distract 50 guards with Hayato's stone.
Kill 10 guards with traps in Hana Gakuen.
Hide with all characters in a single bush.
Fail the Shrine riddle at the beginning 3 times.
Finish the mission “Red Lights at Matsuyama”.
Throw a guard into a well.
Hide 150 bodies.
Finish the mission “The Best Laid Plans”.
Kill the Captain.
Kill a Samurai with a flower pot.
Hide 100 bodies.
Execute a plan with all 5 characters.
Kill or knock out 5 guards at the same time with all 5 characters.
Kill or knock out 150 guards.
Travel 1200 meters in water during the mission “The Best Laid Plans”.
Find the perfect spot for sunbathing.
Finish the mission “A Night at Sea”
Kill at least 3 guards in the mission “A Night at Sea”.
Finish the mission “Reunion at Nagoya”.
Kill or knock out 100 guards.
Come out of the other side of the river in Nagoya.
Hide 50 bodies.
Talk to a samurai when disguised with Aiko.
Kill or knock out 50 guards.
Kill 10 guards with a drop attack.
Kill 20 guards with Mugen's Swordwind.
3 times in one mission, kill 2 guards at once with Mugen's Swordwind.
Kill a guard with a drop attack from a rope.