The Battlestar Achilles is an Achilles Class Battlestar and was the thirteen Battlestar that was built during the First Cylon War. It was lost during the First Battle of Cosmora, when its commanding officer ordered a blind jumps to prevented the ships from being taken by the Cylons and the Cylons using it against the rest of the Battle Group. It was later found by Admiral Tolan and retaken by the Colonials. After the Achilles was retaken, it was put back into service. While the Achilles looks like the Columbia Class, it is larger and has two more engines. Also the Achilles is the only ship of it class built.
The Battlestar Achilles's image is taking from tan.J website and is base on the Battlestar Hyades.