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