Here is the full list of all 44 Shadow Tactics: Blades of the Shogun - there are Aiko's Choice achievements.
Kill Lady Chiyo with any character other than Aiko.
Collect 17 badges.
Kill 10 guards with Takuma's Sniper Rifle that are farther than 25 meters away from him.
Talk to a samurai when disguised with Aiko.
Kill all enemies at the mansion in Nagoya.
Kill 30 guards with the help of the environment.
Come out of the other side of the river in Nagoya.
Kill a guard with a drop attack from a rope.
Throw a guard into a well.
Find all hidden caves in Hana Gakuen.
Use Aiko's disguise 15 times.
Finish all missions.
Listen to everything Kuma has to say.
Finish “The Secrets of Hana Gakuen”.
Kill Lady Chiyo without getting a disguise.
Kill a samurai with a rock.
Hide 150 bodies.
Kill 10 guards with traps in Hana Gakuen.
Kill 3 Samurai with Yuki.
Hide with all characters in a single bush.
Fail the Shrine riddle at the beginning 3 times.
Kill at least 3 guards in the mission “A Night at Sea”.
Finish the mission “Red Lights at Matsuyama”.
Don't extinguish any light sources in Matsuyama.
Kill 20 guards with Mugen's Swordwind.
Finish the mission “The Best Laid Plans”.
Don't kill anyone with Takuma during the mission “The Best Laid Plans.”
Kill 10 guards with a drop attack.
Hide 100 bodies.
Kill the Captain.
Travel 1200 meters in water during the mission “The Best Laid Plans”.
Kill or knock out 5 guards at the same time with all 5 characters.
Execute a plan with all 5 characters.
Kill a Samurai with a flower pot.
Find the perfect spot for sunbathing.
Kill or knock out 150 guards.
Finish the mission “A Night at Sea”
Distract 4 guards at the same time with Kuma.
Finish the mission “Reunion at Nagoya”.
Hide 50 bodies.
Kill or knock out 100 guards.
Distract 50 guards with Hayato's stone.
3 times in one mission, kill 2 guards at once with Mugen's Swordwind.
Kill or knock out 50 guards.