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