Conversation so far:
What dentention was Chen Guangcheng involved in?
On 7 September 2005, Chen Guangcheng was reportedly abducted by security agents from Linyi and held for 38 hours in Beijing.
What became of the 2005 Beijing detention of Chen Guangcheng?
After Chen Guangcheng refused to cease his activism, Linyi authorities placed him under house arrest. When he attempted to escape in October, he was beaten.
Why was Chen Guangcheng detained by Yinan county officials?
Chen Guangcheng said that authorities threatened to levy criminal charges against him for providing state secrets or intelligence to foreign organizations.
Are there any other interesting aspects about this article on Chen Guangcheng?
In October 2013, Chen Guangcheng accepted a position with the conservative research group Witherspoon Institute, and a position at the Catholic University of America.
Did Chen Guangcheng face charges for destruction of property alleged by Xinhua news agency?
On 24 August 2006, Chen Guangcheng was sentenced to four years and three months for damaging property and organizing a mob to disturb traffic.
did Chen Guangcheng get out early after being sentenced to prison in 2006?
Chen Guangcheng was released from prison in 2010.

Question: what was his greatest accomplishment?
Self-contained rewrite: What was Chen Guangcheng's greatest accomplishment?