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