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 with any character other than Aiko.
Kill a samurai with a rock.
Kill 3 Samurai with Yuki.
Kill a guard with a drop attack from a rope.
Distract 4 guards at the same time with Kuma.
Finish all missions.
Listen to everything Kuma has to say.
Kill Lady Chiyo without getting a disguise.
Execute a plan with all 5 characters.
Kill or knock out 5 guards at the same time with all 5 characters.
Finish “The Secrets of Hana Gakuen”.
Use Aiko's disguise 15 times.
Distract 50 guards with Hayato's stone.
Kill 10 guards with traps in Hana Gakuen.
Kill 30 guards with the help of the environment.
Hide with all characters in a single bush.
Fail the Shrine riddle at the beginning 3 times.
Come out of the other side of the river in Nagoya.
Talk to a samurai when disguised with Aiko.
Find the perfect spot for sunbathing.
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.”
Collect 17 badges.
Finish the mission “The Best Laid Plans”.
Kill 10 guards with Takuma's Sniper Rifle that are farther than 25 meters away from him.
Kill the Captain.
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 all enemies at the mansion in Nagoya.
Kill or knock out 150 guards.
Hide 100 bodies.
Kill a Samurai with a flower pot.
Kill or knock out 100 guards.
Finish the mission “Reunion at Nagoya”.
Kill 10 guards with a drop attack.
Kill 20 guards with Mugen's Swordwind.
Hide 50 bodies.
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.