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