I 100%ed Dragon Age last week for the 360. Actually wasn't as hard to do as I thought, and have definitely noticed instances in which you can work the system to easily get achievements (for example, save right before you complete a Warden Quest, do the option you don't want to do, unlock achievement, reload, do the option you do want to do, unlock achievement). Kind of wish I'd known that the first time around considering I think I ended up beating the game like 5 times. The sad thing is, like Batman, which was another favorite of mine that I 100%ed, I have virtually no desire to go back and play this.
I'm also still bitter at how much Ostegar sucked.