This is obtained once you’ve spent 3 Talent points to max out any of the following Talent trees:
This will take a lot of leveling up as you obtain Talent points every 4 levels. However, if you want to knock this out quickly you can do so at around level 13 as long as you have a Memory Crystal. You are given a free one at the beginning of the game so hopefully you haven’t used it yet. Save your game, use the memory crystal to reset all Skill, Attribute and Talent points. Now allocate 3 Talent points into a single Talent and your achievement should pop. Now you can load your save and continue on as normal.