If you were to read the achievements list for Infinity Blade II, you'd come across a rather peculiar one called 'Mind Over Matter'. To get this one, you have to defeat an enemy without attacking him. Say what?
Over on the Epic Games forums, user AzrinRain (Who also captured the photo above) came up with a fairly simple solution for getting this achievement. Basically, you have to get a gem that will do damage to your enemy every time you block. And that's it, really. Just note that parrying counts as swinging your sword at the Titan, and don't even think of trying to use magic. Oh, and if you were to swing at the defeated Titan to get bonus XP, you'll forfeit the achievement.