Since I reached "Destroyer" with my halforc fighter/blackguard and "Rebel" with my halfling rogue, I did a search on the official forums and found a list of the other alignment titles:
Lawful Good: Crusader
Neutral Good: Benefactor
Chaotic Good: Rebel
Lawful Neutral: Judge
True Neutral: Reconciler
Chaotic Neutral: Free Spirit
Lawful Evil: Dominator
Neutral Evil: Malefactor
Chaotic Evil: Destroyer