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Most difficult achievement in The Witcher 2: Assassins of Kings Enhanced Edition for PC

Most difficult achievement in The Witcher 2: Assassins of Kings Enhanced Edition for PC
Who
“Madman”
Where
Not Applicable
When
02 April 2015
As of 2 April 2015, only 0.5% of PC players have unlocked the “Madman” achievement in The Witcher 2: Assassins of Kings Enhanced Edition (CD Projekt RED, 2012), successfully beating the game on its "Insane" difficulty level.