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.
Listen to everything Kuma has to say.
Find all hidden caves in Hana Gakuen.
Kill Lady Chiyo with any character other than Aiko.
Kill a samurai with a rock.
Kill Lady Chiyo without getting a disguise.
Distract 4 guards at the same time with Kuma.
Hide with all characters in a single bush.
Don't extinguish any light sources in Matsuyama.
Don't kill anyone with Takuma during the mission “The Best Laid Plans.”
Collect 17 badges.
Kill 3 Samurai with Yuki.
Kill at least 3 guards in the mission “A Night at Sea”.
Kill 30 guards with the help of the environment.
Finish all missions.
Finish “The Secrets of Hana Gakuen”.
Use Aiko's disguise 15 times.
Kill or knock out 5 guards at the same time with all 5 characters.
Kill 10 guards with traps in Hana Gakuen.
Fail the Shrine riddle at the beginning 3 times.
Finish the mission “Red Lights at Matsuyama”.
Hide 150 bodies.
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 a Samurai with a flower pot.
Hide 100 bodies.
Kill or knock out 150 guards.
Find the perfect spot for sunbathing.
Execute a plan with all 5 characters.
Finish the mission “A Night at Sea”
Kill all enemies at the mansion in Nagoya.
Finish the mission “Reunion at Nagoya”.
Distract 50 guards with Hayato's stone.
Talk to a samurai when disguised with Aiko.
Kill or knock out 100 guards.
Kill 20 guards with Mugen's Swordwind.
Hide 50 bodies.
Kill 10 guards with a drop attack.
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.
Throw a guard into a well.