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 a samurai with a rock.
Kill or knock out 5 guards at the same time with all 5 characters.
Listen to everything Kuma has to say.
Find the perfect spot for sunbathing.
Come out of the other side of the river in Nagoya.
Kill Lady Chiyo with any character other than Aiko.
Talk to a samurai when disguised with Aiko.
Execute a plan with all 5 characters.
Fail the Shrine riddle at the beginning 3 times.
Distract 4 guards at the same time with Kuma.
Kill 3 Samurai with Yuki.
Kill a Samurai with a flower pot.
Kill all enemies at the mansion in Nagoya.
Kill a guard with a drop attack from a rope.
Kill 10 guards with a drop attack.
Kill Lady Chiyo without getting a disguise.
Don't extinguish any light sources in Matsuyama.
Distract 50 guards with Hayato's stone.
Collect 17 badges.
Don't kill anyone with Takuma during the mission “The Best Laid Plans.”
Finish all missions.
Finish “The Secrets of Hana Gakuen”.
Use Aiko's disguise 15 times.
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.
Finish the mission “Red Lights at Matsuyama”.
Finish 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 100 bodies.
Kill or knock out 150 guards.
Travel 1200 meters in water during the mission “The Best Laid Plans”.
Kill or knock out 100 guards.
Finish the mission “A Night at Sea”
Kill at least 3 guards in the mission “A Night at Sea”.
Finish the mission “Reunion at Nagoya”.
Hide 50 bodies.
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.
Throw a guard into a well.