A practitioner should remain quiet about his achievements and flaunt his mistakes. Why? If we reveal our wrongdoings and mistakes to others, our karmic obstructions will be cleared. If we cover them up, the karmic obstructions will become even heavier. If we have reached certain goals or received credit for our accomplishments, we should keep them to ourselves as much as possible, and do not flaunt them. This is a good way to enhance our blessings and clear our karmic obstructions.
Above all, though we can certainly clear our karmic offenses through Amitabha-recitation, we should also sincerely review and reveal our wrongdoings. Otherwise, it is like sweeping the floor with your right hand; but, sprinkling the dust with your left. It is unwise to do that.