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