Here is the full list of all 28 Trek to Yomi achievements.
Finish Chapter 1
Finish Chapter 2
Finish Chapter 3
Finish Chapter 4
Collect first Upgrade
Execute 50 successful counters
Perform 50 finishers
Kill 1st enemy
Finish Chapter 5
Finish Chapter 6
Complete the game
Collect all Upgrades
Find all lore collectibles
Complete the game in Ronin mode
Complete the game with the path of love
Complete the game with the path of fury
Complete the game with the path of duty
Kill 3 enemy at once with ozutsu
For killing the boss in chapter 3
Kill Sadatame without getting hit
Kill Kagerou Shogun without getting hit
Kill Aiko Demon without getting hit
Kill Sanjuro Demon without getting hit
Kill Hiroki Demon without getting hit
Kill Kagerou Demon without getting hit
Complete the game on Kensei mode
Complete a whole chapter without dying and using a shrine
Kill 10 enemies without using any weapon