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