Here is the full list of all 13 Katana Soul achievements.
beat the game (C64 difficult mode)
Kills 200 enemies in survival mode
Kills 160 enemies in survival mode
Kills 120 enemies in survival mode
Kills 70 enemies in survival mode
Kills 50 enemies in survival mode
Kills 20 enemies in survival mode
beat the game (normal mode)
Beat Yurei Ghost
The eyes of the karma
Unlock the way in the cave
RIP
Eat a onigiri