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