Here is the full list of all 12 Don'Yoku achievements.
Unlock Tomoe Gozen
Defeat Heavens Emperor on normal or harder difficulty.
Complete the game on normal difficulty without using a continue.
Make a million coins in a single stage.
Defeat Ironclad on normal or harder difficulty.
Defeat the Twin Furies on normal or harder difficulty.
Defeat Titanic Camel on normal or harder difficulty.
Defeat Iron Pigeon on normal or harder difficulty.
Complete the game on arcade difficulty without using a continue.
Complete the game on maniac difficulty without using a continue.
Complete the game with Tomoe Gozen on normal or harder difficulty.
Make 5 millions coins in a single stage.