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