A simple (slow but quite safe) way to deal with him as early as possible, with the sword only, is to parry and gain distance from him. Then when you're far enough and his swings/lunges miss you you can counter with a 3 or 4 hits combo to damage him. This strategy works on higher difficulties too, but is more frequently countered and of course takes longer to be victorious. You can get the achievement on Easy.

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