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