Here is the full list of all 44 Shadow Tactics: Blades of the Shogun - there are Aiko's Choice achievements.
Find all hidden caves in Hana Gakuen.
Kill Lady Chiyo without getting a disguise.
Kill or knock out 5 guards at the same time with all 5 characters.
Execute a plan with all 5 characters.
Collect 17 badges.
Kill 10 guards with Takuma's Sniper Rifle that are farther than 25 meters away from him.
Come out of the other side of the river 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.
Talk to a samurai when disguised with Aiko.
Distract 50 guards with Hayato's stone.
Kill a samurai with a rock.
Use Aiko's disguise 15 times.
Kill 30 guards with the help of the environment.
Hide with all characters in a single bush.
Kill 10 guards with traps in Hana Gakuen.
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.”
Find the perfect spot for sunbathing.
Kill the Captain.
Kill a Samurai with a flower pot.
Hide 150 bodies.
Travel 1200 meters in water during the mission “The Best Laid Plans”.
Kill 3 Samurai with Yuki.
Finish the mission “A Night at Sea”
Kill at least 3 guards in the mission “A Night at Sea”.
Distract 4 guards at the same time with Kuma.
Finish the mission “Reunion at Nagoya”.
Kill all enemies at the mansion in Nagoya.
Hide 100 bodies.
Kill or knock out 150 guards.
Hide 50 bodies.
Kill or knock out 100 guards.
3 times in one mission, kill 2 guards at once with Mugen's Swordwind.
Kill or knock out 50 guards.
Kill 20 guards with Mugen's Swordwind.
Kill 10 guards with a drop attack.
Kill a guard with a drop attack from a rope.
Throw a guard into a well.