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