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