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