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.
Collect 17 badges.
Find all hidden caves in Hana Gakuen.
Kill a samurai with a rock.
Kill 30 guards with the help of the environment.
Come out of the other side of the river in Nagoya.
Don't extinguish any light sources in Matsuyama.
Throw a guard into a well.
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.
Distract 4 guards at the same time with Kuma.
Kill 10 guards with traps in Hana Gakuen.
Kill or knock out 5 guards at the same time with all 5 characters.
Hide with all characters in a single bush.
Fail the Shrine riddle at the beginning 3 times.
Execute a plan with all 5 characters.
Finish the mission “Red Lights at Matsuyama”.
Finish the mission “The Best Laid Plans”.
Don't kill anyone with Takuma during the mission “The Best Laid Plans.”
Hide 150 bodies.
Kill a Samurai with a flower pot.
Travel 1200 meters in water during the mission “The Best Laid Plans”.
Kill the Captain.
Find the perfect spot for sunbathing.
Kill or knock out 150 guards.
Kill 20 guards with Mugen's Swordwind.
Hide 100 bodies.
Kill 3 Samurai with Yuki.
Kill 10 guards with Takuma's Sniper Rifle that are farther than 25 meters away from him.
Finish the mission “A Night at Sea”
Kill at least 3 guards in the mission “A Night at Sea”.
Finish the mission “Reunion at Nagoya”.
Kill all enemies at the mansion in Nagoya.
Kill or knock out 100 guards.
Kill 10 guards with a drop attack.
Use Aiko's disguise 15 times.
Distract 50 guards with Hayato's stone.
Hide 50 bodies.
Kill or knock out 50 guards.
Talk to a samurai when disguised with Aiko.
Kill a guard with a drop attack from a rope.
3 times in one mission, kill 2 guards at once with Mugen's Swordwind.