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