You gain force points by killing enemies with force powers and combos. Frenzies and varying your force power use will increase the bonuses for the amount of force points earned. For these achievements I recommend doing the TIE Factory because it’s quick and the enemies are easy. It took me only two full playthroughs on apprentice (including collecting Holocrons) to get this achievement. It’s best to do this after you beat the game since your character will be much more powerful. Also there are several areas of the level that have a lot of enemies which will allow you to get frenzy bonuses.