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