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