Here is the full list of all 44 Shadow Tactics: Blades of the Shogun - there are Aiko's Choice achievements.
Collect 17 badges.
Kill Lady Chiyo without getting a disguise.
Find all hidden caves in Hana Gakuen.
Kill Lady Chiyo with any character other than Aiko.
Kill a samurai with a rock.
Distract 4 guards at the same time with Kuma.
Kill 30 guards with the help of the environment.
Finish all missions.
Listen to everything Kuma has to say.
Finish “The Secrets of Hana Gakuen”.
Talk to a samurai when disguised with Aiko.
Use Aiko's disguise 15 times.
Kill or knock out 5 guards at the same time with all 5 characters.
Kill 10 guards with traps in Hana Gakuen.
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.
Kill 10 guards with a drop attack.
Kill the Captain.
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.”
Hide 150 bodies.
Kill 3 Samurai with Yuki.
Travel 1200 meters in water during the mission “The Best Laid Plans”.
Find the perfect spot for sunbathing.
Hide 100 bodies.
Distract 50 guards with Hayato's stone.
Finish the mission “A Night at Sea”
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.
Kill a Samurai with a flower pot.
Kill a guard with a drop attack from a rope.
Finish the mission “Reunion at Nagoya”.
Kill or knock out 150 guards.
Kill or knock out 100 guards.
Hide 50 bodies.
Kill 20 guards with Mugen's Swordwind.
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.