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