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.
Distract 50 guards with Hayato's stone.
Hide with all characters in a single bush.
Finish the mission “Red Lights at Matsuyama”.
Kill 10 guards with a drop attack.
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 150 bodies.
Travel 1200 meters in water during the mission “The Best Laid Plans”.
Kill or knock out 150 guards.
Finish 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.
Hide 100 bodies.
Kill or knock out 100 guards.
Kill 20 guards with Mugen's Swordwind.
Use Aiko's disguise 15 times.
Hide 50 bodies.
Kill or knock out 50 guards.
Kill a guard with a drop attack from a rope.
3 times in one mission, kill 2 guards at once with Mugen's Swordwind.
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 3 Samurai with Yuki.
Talk to a samurai when disguised with Aiko.
Kill a samurai with a rock.
Kill a Samurai with a flower pot.
Find the perfect spot for sunbathing.
Come out of the other side of the river in Nagoya.
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.”
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.