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