Here is the full list of all 14 GetsuFumaDen achievements.
Obtain a third demon mask charm
Improve your sword to the highest quality
Obtain one demon mask charm
Obtain a second demon mask charm
Obtain a 1UP item
Obtain a hadouken
Obtain a second hadouken
Obtain a third hadouken
Defeat your first enemy
Have the god of fortune run out of money
Collect 9,999 money
Collect all defensive items
Collect all offensive items
Raise your sword power level up to 32