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