Here is the full list of all 78 Within the Blade achievements.
50 kills by shurikens
Assassinate 500 enemies
Learn all skills in the Shurikenjutsu techniques
Kill Mamoru
Kill Oni
Kill 50 heavy samurai
Restore the village
Kill Fudo
Kill Tengu
Collect 5000 coins
50 kusarigama kills
Кusarigama kill
Kill Tabiakindo
Learn all skills in the Kusarigama combat
Kill Jorogumo
Kill 15 heavy samurai
Learn all the skills of the blacksmith
Kill first boss
Break the Sword
100 kills by explosions
50 kills by explosions
Pull the enemy with the hook
Kill Asura
Destroy 200 boxes
Assassinate 250 enemies
Collect 1000 coins
Behead 100 enemies
Guess the recipe
Kill Shutendoji
500 kills
Craft anything
Collect 500 coins
Murder in melee
Kill by fire
Kill by explosions
Kill by poison
Complete challenge
Complete all challenges
Kill by shurikens
Kill Gashadokuro
Assassinate 50 enemies
100 kills
Seppuku
Assassination
Make a purchase
Complete the first mission
First kill
Behead 500 enemies
Kill 100 heavy samurai
Assassinate 10000 enemies
250 kills by shurikens
Make 100 diagonal cuts
Make 500 diagonal cuts
Make 100 horizontal cuts
Make 500 horizontal cuts
150 kusarigama kills
50 murders in the melee
250 murders in the melee
500 murders in the melee
Learn all skills in the hand-to-hand combat
Learn all skills in the Shinobigatana combat
Complete the game (permadeath mode)
Complete all tasks in 1 act
Complete all tasks in 2 act
Complete all tasks in 3 act
Complete all tasks in 4 act
Find all coins in challenges
Kill an enemy with skill
Block 10 Shuriken or Arrows