Unless you used another storage device to keep a backup save, no. Pressing Y should show you the things you did and how each affected your weapon. It may have nothing to do with being good or evil in your case.
More or less. A different part of the weapon morphs each time you do an upgrade after you open the melee and ranged chests on the Road to Rule. That which affects the morph is chosen from a pool based on what you have done up to that point. Some think the pool is completely random, but my experience suggests that there is some priority system with a bit of randomization-- like a percentage chance.