Here is the full list of all 44 Shadow Tactics: Blades of the Shogun - there are Aiko's Choice achievements.
Collect 17 badges.
Don't kill anyone with Takuma during the mission “The Best Laid Plans.”
Come out of the other side of the river in Nagoya.
Fail the Shrine riddle at the beginning 3 times.
Finish all missions.
Listen to everything Kuma has to say.
Find all hidden caves in Hana Gakuen.
Finish “The Secrets of Hana Gakuen”.
Use Aiko's disguise 15 times.
Talk to a samurai when disguised with Aiko.
Kill a samurai with a rock.
Kill Lady Chiyo without getting a disguise.
Kill Lady Chiyo with any character other than Aiko.
Distract 50 guards with Hayato's stone.
Kill 30 guards with the help of the environment.
Kill 10 guards with traps in Hana Gakuen.
Kill or knock out 5 guards at the same time with all 5 characters.
Hide with all characters in a single bush.
Finish the mission “Red Lights at Matsuyama”.
Don't extinguish any light sources in Matsuyama.
Finish the mission “The Best Laid Plans”.
Kill a Samurai with a flower pot.
Hide 150 bodies.
Travel 1200 meters in water during the mission “The Best Laid Plans”.
Kill 3 Samurai with Yuki.
Find the perfect spot for sunbathing.
Kill the Captain.
Kill 10 guards with Takuma's Sniper Rifle that are farther than 25 meters away from him.
Kill or knock out 150 guards.
Hide 100 bodies.
Execute a plan with all 5 characters.
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.
Kill 20 guards with Mugen's Swordwind.
Hide 50 bodies.
3 times in one mission, kill 2 guards at once with Mugen's Swordwind.
Kill or knock out 50 guards.
Kill 10 guards with a drop attack.
Kill a guard with a drop attack from a rope.
Throw a guard into a well.