http://lxqyom6a3p6fdgsy6mpjyhjqjdpzleseck2jojwwzcilmsvduaeo7zyd.onion/bitcoin-private-key-directory/index.html
In theory, it is, but the practical problem is that such a list would require more storage space than the size of the known universe. Until we discover true quantum computing, we are restricted to producing partial lists of private keys. (Which is probably a good thing, since if anyone could bruteforce Bitcoin, they would instantly decrease to zero value and cease to exist.)