How to unlock: You have to advance one power to Level 6.
Commentary: Choose one skill from every skill tree. You can't use passive skills to get the trophy.
Another rather simple trophy to get, but it comes with a little catch - you can acquire it only by unlocking 3 powers to the maximum level (6th), but you have to use Powers, not Passive abilities. Most of the abilities in a skill tree are classified as Powers - last 2 or 3 are, in most cases, passive abilities.
If you don't have enough points to unlock all of the required abilities, you can either way and accumulate more, or you can go to a Re-Spec station to reset your abilities (more on that can be found in "How to reset skill points of your character?" chapter). Reset your abilities to regain skill points, use them to max out three different Powers, one for each skill tree and, once you've gained the trophy, reset the skills again.