Finally got some time to sit down and play again and finished this guy last night with all As & Bs. A ton of fun right to the end...though the final battle could have been a little better IMO. Some things I am not sure I understand: it says unlocked achievement such-and-such, but what does that mean? Does it tell you somewhere what you have and have not unlocked? Does that unlock additional content the way Darkness does? I didn't see anything like that. Overall, thumbs up for this game.