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