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