Here is the full list of all 44 Shadow Tactics: Blades of the Shogun - there are Aiko's Choice achievements.
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 all enemies at the mansion in Nagoya.
Collect 17 badges.
Kill or knock out 5 guards at the same time with all 5 characters.
Find all hidden caves in Hana Gakuen.
Kill a samurai with a rock.
Talk to a samurai when disguised with Aiko.
Kill Lady Chiyo with any character other than Aiko.
Kill Lady Chiyo without getting a disguise.
Use Aiko's disguise 15 times.
Don't extinguish any light sources in Matsuyama.
Don't kill anyone with Takuma during the mission “The Best Laid Plans.”
Kill 3 Samurai with Yuki.
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 all missions.
Finish “The Secrets of Hana Gakuen”.
Execute a plan with all 5 characters.
Hide with all characters in a single bush.
Hide 150 bodies.
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”.
Kill a Samurai with a flower pot.
Travel 1200 meters in water during the mission “The Best Laid Plans”.
Kill the Captain.
Hide 100 bodies.
Kill or knock out 150 guards.
Kill 20 guards with Mugen's Swordwind.
Finish the mission “A Night at Sea”
Kill at least 3 guards in the mission “A Night at Sea”.
Distract 4 guards at the same time with Kuma.
Finish the mission “Reunion at Nagoya”.
Kill or knock out 100 guards.
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.
Kill a guard with a drop attack from a rope.
Throw a guard into a well.