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