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