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