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