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.
Use Aiko's disguise 15 times.
Kill Lady Chiyo with any character other than Aiko.
Don't extinguish any light sources in Matsuyama.
Find the perfect spot for sunbathing.
Collect 17 badges.
Kill all enemies at the mansion in Nagoya.
Come out of the other side of the river in Nagoya.
Talk to a samurai when disguised with Aiko.
Kill a samurai with a rock.
Finish all missions.
Listen to everything Kuma has to say.
Finish “The Secrets of Hana Gakuen”.
Kill Lady Chiyo without getting a disguise.
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.
Hide with all characters in a single bush.
Kill 30 guards with the help of the environment.
Kill 10 guards with traps in Hana Gakuen.
Fail the Shrine riddle at the beginning 3 times.
Finish the mission “Red Lights at Matsuyama”.
Finish the mission “The Best Laid Plans”.
Don't kill anyone with Takuma during the mission “The Best Laid Plans.”
Kill the Captain.
Hide 150 bodies.
Kill a Samurai with a flower pot.
Travel 1200 meters in water during the mission “The Best Laid Plans”.
Kill 3 Samurai with Yuki.
Kill or knock out 150 guards.
Hide 100 bodies.
Finish the mission “A Night at Sea”
Distract 4 guards at the same time with Kuma.
Kill at least 3 guards in the mission “A Night at Sea”.
Finish the mission “Reunion at Nagoya”.
Kill or knock out 100 guards.
Kill 20 guards with Mugen's Swordwind.
Kill a guard with a drop attack from a rope.
Kill 10 guards with a drop attack.
Hide 50 bodies.
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.