A. T. Ariyaratne, the founder and president of the Sarvodaya Shramadana Movement in Sri Lanka, has had several significant achievements throughout his life. Some of his greatest accomplishments include:

1. Shaping the Sarvodaya Movement: Ariyaratne is known for shaping the Sarvodaya Movement in Sri Lanka, which is the world’s largest spiritually-based people’s development movement.

2. Promoting Gandhian principles: He is a strong believer in Gandhian principles of non-violence, rural development, and self-sacrifice, and has worked to promote these values through his leadership in the Sarvodaya Movement.

3. Sustainable community development: Dr. Ariyaratne and the Sarvodaya Movement have created a model for sustainable community development and movement-building that continues to inspire others.

4. Leadership and compassion: His leadership style, rooted in compassion and Buddhist philosophy, has inspired many to work towards positive change in their communities. These achievements have left a lasting impact on society and have contributed to the betterment of communities in Sri Lanka and beyond.