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