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