PSIV has a lot of sidequests. Not just in the Hunter's Guild, but there's also extra areas on each planet that you can find only by exploring. Places like the Wrecked Ship, the Dezo Climate Control or Weapons plant.
When you play the game, do you do all of these areas or skip any of them? Did you find them the first time you played or not until a later playthrough?
I found most of them the first time I played, but I think I forgot to go back to the Anger tower. I might have missed the Weapons plant. It was really in an out of the way place.