The minimum number of points you need for this to unlock is 6 split evenly between the 3 talents (Might, Finesse and Sorcery) so:
2 Might 2 Finesse 2 SorceryOnce you have completed all your skill points, talent points, etc and finished the leveling up process, this trophy should unlock.
It is also possible to unlock the "Some Of This, Some Of That" trophy at the same time, assuming you have a minimum of 6 points in 2 different tracks. Also note that you do not need to select the Destiny, just having it unlocked as an option nets the trophy.