Here is the full list of all 43 Shigatari achievements.
Gain the demon's power
Master the weapon mastery
Complete three regions without fighting any women
Master the stance mastery
Beat the game with sincerity
Beat the game on hard difficulty
Beat the game on hard with no ancestor favor spent
Meditate under a waterfall with hachimaki and salt
Have one thousand coins
Defeat a demon
Master the waki stance
Change clothing during combat without dying
Master the judan stance
Beat the game on normal difficulty
Master the hasso stance
Drink gaijin sake with gaijin weapon and armor equipped
Beat the game with brazen
Beat the game with cunning
Complete five regions saying "Die." at every opportunity
Decapitate a boss with a single blow
Master the chudan stance
Beat the game with grace
Beat the game with courage
Beat the game only changing weapons once
Beat the game on easy difficulty
Defeat the judan master
Eat 10 pieces of sushi
Visit three bridges in a single region
Defeat the Weapon Master
Complete five regions without saying "Die"'
Defeat the Waki Master
Forge the legendary sword Masamune
Defeat the Gedan Master
Master the gedan stance
Defeat the chudan master
Defeat the Hasso Master
Defeat the Stance Master
Drink 10 jars of sake
Complete three regions without fighting any men
Show up late to a duel, then win with a bokken
Beat the game with prudence
See every ending
Beat the game killing only six people