Here is the full list of all 44 Shadow Tactics: Blades of the Shogun - there are Aiko's Choice achievements.
Collect 17 badges.
Come out of the other side of the river in Nagoya.
Fail the Shrine riddle at the beginning 3 times.
Throw a guard into a well.
Find the perfect spot for sunbathing.
Finish all missions.
Listen to everything Kuma has to say.
Find all hidden caves in Hana Gakuen.
Finish “The Secrets of Hana Gakuen”.
Talk to a samurai when disguised with Aiko.
Kill Lady Chiyo with any character other than Aiko.
Kill Lady Chiyo without getting a disguise.
Kill a samurai with a rock.
Distract 4 guards at the same time with Kuma.
Hide with all characters in a single bush.
Kill or knock out 5 guards at the same time with all 5 characters.
Kill 10 guards with Takuma's Sniper Rifle that are farther than 25 meters away from him.
Kill 10 guards with traps in Hana Gakuen.
Finish the mission “Red Lights at Matsuyama”.
Don't extinguish any light sources in Matsuyama.
Finish the mission “The Best Laid Plans”.
Don't kill anyone with Takuma during the mission “The Best Laid Plans.”
Kill the Captain.
Kill 3 Samurai with Yuki.
Travel 1200 meters in water during the mission “The Best Laid Plans”.
Kill a Samurai with a flower pot.
Hide 150 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”.
Finish the mission “Reunion at Nagoya”.
Kill all enemies at the mansion in Nagoya.
Kill 10 guards with a drop attack.
Use Aiko's disguise 15 times.
Hide 100 bodies.
Kill 30 guards with the help of the environment.
Distract 50 guards with Hayato's stone.
Hide 50 bodies.
Kill or knock out 150 guards.
Kill or knock out 100 guards.
Kill or knock out 50 guards.
Kill 20 guards with Mugen's Swordwind.
3 times in one mission, kill 2 guards at once with Mugen's Swordwind.
Kill a guard with a drop attack from a rope.