Here is the full list of all 50 Dynasty Warriors 6 Empires achievements worth 1,000 gamerscore.
Cleared by completing a battle as Cao Cao
Cleared by completing a battle as Sun Shang Xiang
Cleared by completing a battle as Gan Ning
Cleared by completing a battle as Cao Pi
Cleared by completing a battle as Xiahou Dun
Cleared by completing a battle as Zhou Tai
Cleared by completing a battle as a custom character
Cleared by reaching the end of the "Yellow Turban Rebellion" scenario
Cleared by completing a battle as Sima Yi
Cleared by completing a battle as Lu Meng
Cleared by completing a battle as Guan Yu
Cleared by completing a battle as Zhang Fei
Cleared by completing a battle as Zhang Liao
Cleared by completing a battle as Zhuge Liang
Cleared by completing a battle as Liu Bei
Cleared by completing a battle as Pang Tong
Cleared by completing a battle as Dian Wei
Cleared by completing a battle as Cao Ren
Cleared by completing a battle as Huang Gai
Cleared by completing a battle as Ma Chao
Cleared by completing a battle as Zhen Ji
Cleared by reaching the end of the "Battle of Guan Du" scenario
Cleared by completing a battle as Zhao Yun
Cleared by completing a battle as Diao Chan
Cleared by completing a battle as Huang Zhong
Cleared by completing a battle as Lu Xun
Cleared by unlocking all bonus material
Cleared by reaching the end of all scenarios
Cleared by reaching the end of the "Battle of Chi Bi" scenario
Cleared by reaching the end of the "Three Kingdoms" scenario
Cleared by reaching the end of the "A Land in Chaos" scenario
Cleared by completing a battle as Zhou Yu
Cleared by completing a battle as Zhang Jiao
Cleared by completing a battle as Zhang He
Cleared by completing a battle as Yue Ying
Cleared by completing a battle as Yuan Shao
Cleared by completing a battle as Xu Zhu
Cleared by completing a battle as Xu Huang
Cleared by completing a battle as Xiao Qiao
Cleared by completing a battle as Wei Yan
Cleared by completing a battle as Taishi Ci
Cleared by completing a battle as Sun Jian
Cleared by completing a battle as Sun Ce
Cleared by completing a battle as Meng Huo
Cleared by completing a battle as Lu Bu
Cleared by completing a battle as Dong Zhuo
Cleared by completing a battle as Xiahou Yuan
Cleared by completing a battle as Sun Quan
Cleared by completing a battle as Guan Ping
Cleared by completing a battle as Ling Tong