...only .1% of all players have let the barbarians get one of their cities.
hehe, I wanted the achievement so I setup a game with standard map, 1 opponent (ghandi), raging barbarians and built a couple cities near barbarian camps, then just sat back and waited. Took them like 40 turns of just circling my cities before they actually took one. Oh well, with no units, it didn't take long between hitting end turn...
...more people registering the game caused the 0.1% to round down to 0%...
That seems reasonable. I unlocked
To Stand the Test of Time on Wednesday, it was like the first thing I did to get a feel for the game, explore each victory condition. It sat at 0% for the first few days, but now it's slowly creeping up 0.2%.
There would seem to be more achievements that are bugged than just Magellan. An obvious one from looking at the list of regular achievements is
Tomb Raider. For it to still be at 0% that means that less than 1 in 1000 has conquered an Egyptian city that had their UB temple replacement - doesn't seem very likely.
I started another thread to track the hidden achievements
link and it would seem that either the only available source of the descriptions is wrong, or they are really bugged.