Here's a video on how to obtain ALL of the prologue achievements, and more! Links to the specific achievements, in order of when you'll obtain them, are in the video description. I didn't show battles as some are walked through by the AI, and most others are simply auto fought and won. The last one appears very difficult, but my game cut out, and I didn't complete the prologue.
As for this achievement:
1. Skill points are something you will gain with wins and xp earned, found in the character screen.
2. By the end of the prologue, I had 10, and the achievement was obtainable. However, this randomly popped for me when starting up the quest in the blue light. I had only spent about 3 true skill points at this point, so i'm not sure why it popped, but it might for you too!