Here is the full list of all 17 Fist Slash: Of Ultimate Fury achievements.
Complete the fifth stage on EASY difficulty
Complete the fourth stage on EASY difficulty
Complete the third stage on EASY difficulty
Complete the second stage on EASY difficulty
Complete the first stage on EASY difficulty
Complete the first stage on NORMAL difficulty
Complete the second stage on NORMAL difficulty
Complete the third stage on NORMAL difficulty
Complete the fourth stage on NORMAL difficulty
Complete the fifth stage on NORMAL difficulty
Complete the final stage on NORMAL difficulty
Complete the final stage on HOLY GAIDEN difficulty
Complete the fifth stage on HOLY GAIDEN difficulty
Complete the fourth stage on HOLY GAIDEN difficulty
Complete the third stage on HOLY GAIDEN difficulty
Complete the second stage on HOLY GAIDEN difficulty
Complete the first stage on HOLY GAIDEN difficulty