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