Well you can look on the Amnesty International web site, I found a description page there on Prisoners of Conscience that links to individuals. As to individual lists you can across one at Wikipedia but I also found at least one on their site for Cuba that lists many people. You can probably find others, though I didn't do an indepth look on the site.
As to a full list, this news story from The Nation notes that
There is more than one prisoner of conscience in Thailand, although the number of those detained under lese majeste law and their names known to Amnesty International (AI) is "not for public consumption", said Benjamin Zawacki, AI's researcher for Thailand and Burma.
I did not see a similar general note, so you can probably take this as more focusing on Thailand and Burma, where I could see such a public list would endanger those on it.
Considering the list is in flux, and changing all the time, it'd be under constant revision especially since their definition of prisoner of conscience is both sort of flexible and not comprehensive since Amnesty International doesn't take all cases under consideration.