Steam achievements in Civ5/Inconceivable!

{| class="wikitable"
| || Inconceivable!
|
Lose a Game to someone not on your friend's list.
:This is a reference to Vizzini's repeated line from The Princess Bride.
NOTE: This achievement currently seems to be bugged or not yet implemented, as few if any people have gotten it and it lacks a description in the official Steam achievements list.
|}
Category:Steam achievements in Civ5