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.
Listen to everything Kuma has to say.
Find all hidden caves in Hana Gakuen.
Kill a samurai with a rock.
Don't kill anyone with Takuma during the mission “The Best Laid Plans.”
Don't extinguish any light sources in Matsuyama.
Hide 150 bodies.
Kill 3 Samurai with Yuki.
Collect 17 badges.
Find the perfect spot for sunbathing.
Talk to a samurai when disguised with Aiko.
Come out of the other side of the river in Nagoya.
Kill 30 guards with the help of the environment.
Kill at least 3 guards in the mission “A Night at Sea”.
Kill all enemies at the mansion in Nagoya.
Hide 100 bodies.
Throw a guard into a well.
Finish all missions.
Finish “The Secrets of Hana Gakuen”.
Use Aiko's disguise 15 times.
Kill Lady Chiyo with any character other than Aiko.
Kill or knock out 5 guards at the same time with all 5 characters.
Execute a plan with all 5 characters.
Kill 10 guards with traps in Hana Gakuen.
Hide with all characters in a single bush.
Fail the Shrine riddle at the beginning 3 times.
Finish the mission “Red Lights at Matsuyama”.
Finish the mission “The Best Laid Plans”.
Kill the Captain.
Kill 10 guards with Takuma's Sniper Rifle that are farther than 25 meters away from him.
Hide 50 bodies.
Travel 1200 meters in water during the mission “The Best Laid Plans”.
Kill a Samurai with a flower pot.
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”.
Distract 50 guards with Hayato's stone.
Kill 10 guards with a drop attack.
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.
Kill a guard with a drop attack from a rope.