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