I've explored the entire map. I've played an earth map, and circled the world in a sub. I've played a Pangaea and circled the globe by land. I can't think what else could be needed to accomplish this one.
2 Answers
Rather than having to go to another site for the solution, here it is.
To fix the Magellan achievement bug, navigate to your steamapps folder and drill down to:
steamapps\common\sid meier's civilization v\Assets\Gameplay\XML
Open GlobalDefines.xml in notepad
Find:
<Row Name="CIRCUMNAVIGATE_FREE_MOVES">
<Value>0</Value>
</Row>
Change the 0 in the tags to 1.
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Just be aware that this solution changes the rules of the game. You then get additional moves for the circumnavigation. Commented Dec 29, 2010 at 14:31