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