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.
Kill Lady Chiyo without getting a disguise.
Don't extinguish any light sources in Matsuyama.
Collect 17 badges.
Don't kill anyone with Takuma during the mission “The Best Laid Plans.”
Hide 150 bodies.
Use Aiko's disguise 15 times.
Fail the Shrine riddle at the beginning 3 times.
Come out of the other side of the river in Nagoya.
Throw a guard into a well.
Find all hidden caves in Hana Gakuen.
Kill Lady Chiyo with any character other than Aiko.
Kill a samurai with a rock.
Kill 30 guards with the help of the environment.
Hide 100 bodies.
Kill a guard with a drop attack from a rope.
Kill or knock out 5 guards at the same time with all 5 characters.
Talk to a samurai when disguised with Aiko.
Kill 3 Samurai with Yuki.
Finish all missions.
Finish “The Secrets of Hana Gakuen”.
Hide with all characters in a single bush.
Kill 10 guards with traps in Hana Gakuen.
Finish the mission “Red Lights at Matsuyama”.
Finish the mission “The Best Laid Plans”.
Kill a Samurai with a flower pot.
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”.
Find the perfect spot for sunbathing.
Kill 10 guards with a drop attack.
Distract 50 guards with Hayato's stone.
Hide 50 bodies.
Execute a plan with all 5 characters.
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 all enemies at the mansion in Nagoya.
Kill or knock out 150 guards.
Kill or knock out 100 guards.
3 times in one mission, kill 2 guards at once with Mugen's Swordwind.
Kill 20 guards with Mugen's Swordwind.
Kill or knock out 50 guards.