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