This save has:
All Levels Unlocked
All Difficulties completed
All Challenges completed
All Force Powers Maxed
All Saber Crystals Unlocked
All Holocrons found
All Costumes Unlocked
Warning!! Complete the game on easy before using this save or achievements will not be in order!!
Complete any level on easy to unlock all difficulty achievements
Complete the easiest challenge for yourself to unlock all challenge achievements
All kill achievements will only take a couple of kills to complete
I don't remember if there is an achievement for finding all Holocrons. If there is you will need to create another save to find them and get the achievement.