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