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.
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.”
Come out of the other side of the river in Nagoya.
Don't extinguish any light sources in Matsuyama.
Listen to everything Kuma has to say.
Talk to a samurai when disguised with Aiko.
Kill a samurai with a rock.
Kill or knock out 5 guards at the same time with all 5 characters.
Execute a plan with all 5 characters.
Kill a guard with a drop attack from a rope.
Finish all missions.
Finish “The Secrets of Hana Gakuen”.
Collect 17 badges.
Distract 4 guards at the same time with Kuma.
Kill 10 guards with traps in Hana Gakuen.
Hide with all characters in a single bush.
Kill 30 guards with the help of the environment.
Fail the Shrine riddle at the beginning 3 times.
Find the perfect spot for sunbathing.
Kill 10 guards with Takuma's Sniper Rifle that are farther than 25 meters away from him.
Finish the mission “Red Lights at Matsuyama”.
Finish the mission “The Best Laid Plans”.
Kill 3 Samurai with Yuki.
Kill the Captain.
Kill a Samurai with a flower pot.
Travel 1200 meters in water during the mission “The Best Laid Plans”.
Hide 150 bodies.
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.
Distract 50 guards with Hayato's stone.
Kill or knock out 150 guards.
Finish the mission “Reunion at Nagoya”.
Kill all enemies at the mansion in Nagoya.
Hide 100 bodies.
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.