Problem was after I messed around and patiently completed all of the achievements, I stopped worrying about them, and "ran" through the game, often avoiding fights. It was then that I stopped worrying about filling the skill tree, which IS an achievement. I played about 6 games, being super careful not to miss any collectibles, and each time I finished at either 98 or 99 %. Yesterday, I was looking at the skill tree, and was missing three spots. I decided to jump into the game. I found a spot with lots of enemies, and kept killing then re-spawning them until enough points were gained. I filled the skill tree then saved and exited. Going back in, the game finally showed 100%. During story, Cal says he has to re-establish his connection to the force, to "get back to where he was" , meaning part of the JOURNEY is to become a jedi knight, with ALL skills. Anyway this worked for me, now get 100% game completion. Enjoy!