1. Again, neither character has an achievement tied to them. It's tied to you as the player. You can only unlock these Steam achievements once, regardless of what character you use. Of course, there's nothing stopping you from attempting them still -- you just won't get the "Achievement Unlocked!" pop-up. In the case of the Barenziah stones, that's an actual quest in the game, so you'll still get the in-game quest reward and the "Prowler's Profit" effect. 2. I've never heard of that, but I've never played the game on PC with a controller. Don't think I can be of much help. Just note that in some menus, such as the map, buttons have different functions tied to them by design. For example, your in-game sprint button won't do the same thing on the map overlay (you knew this, just illustrating what I'm saying).