Here is the full list of all 44 Shadow Tactics: Blades of the Shogun - there are Aiko's Choice achievements.
Finish all missions.
Finish “The Secrets of Hana Gakuen”.
Kill 10 guards with traps in Hana Gakuen.
Hide with all characters in a single bush.
Finish the mission “Red Lights at Matsuyama”.
Hide 150 bodies.
Finish the mission “The Best Laid Plans”.
Don't kill anyone with Takuma during the mission “The Best Laid Plans.”
Distract 50 guards with Hayato's stone.
Kill 10 guards with a drop attack.
Kill a Samurai with a flower pot.
Travel 1200 meters in water during the mission “The Best Laid Plans”.
Kill or knock out 150 guards.
Hide 100 bodies.
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 all enemies at the mansion in Nagoya.
Kill or knock out 100 guards.
Hide 50 bodies.
3 times in one mission, kill 2 guards at once with Mugen's Swordwind.
Kill or knock out 50 guards.
Throw a guard into a well.
Execute a plan with all 5 characters.
Kill or knock out 5 guards at the same time with all 5 characters.
Collect 17 badges.
Kill 30 guards with the help of the environment.
Kill 10 guards with Takuma's Sniper Rifle that are farther than 25 meters away from him.
Use Aiko's disguise 15 times.
Kill 3 Samurai with Yuki.
Kill a guard with a drop attack from a rope.
Talk to a samurai when disguised with Aiko.
Kill a samurai with a rock.
Find the perfect spot for sunbathing.
Come out of the other side of the river in Nagoya.
Kill the Captain.
Don't extinguish any light sources in Matsuyama.
Kill Lady Chiyo without getting a disguise.
Kill Lady Chiyo with any character other than Aiko.
Find all hidden caves in Hana Gakuen.
Fail the Shrine riddle at the beginning 3 times.
Listen to everything Kuma has to say.