How do I acquire the Combat Acumen ability?

Question

I'm wanting to complete this Steam achievement on The Witcher 2.

How do I acquire the Combat Acumen ability?

Answer 1

Combat Acumen is the second from last unlock/ability in the Swordsmanship tree.

You'll need to level up, presumably focusing on the Swordsmanship tree, until you can unlock the skill. By the look of the image above, you'll need to be at least level 16.