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