Realms of Arkania: Blade of Destiny

To get Thorwal run down by the Orks, you cannot complete the main story-line. So this achievement should be the last thing that you do. Before completing the main story (which is also required for an achievement), make a save that you can return to later.

For reference, the main story consists of:
- The Call to Arms quest
- Collecting all the map pieces
- Hyggelik's Ruin (active after collecting most of the map pieces)
- Orkish Activity quest
- The Final Battle quest

When you're ready for this achievement, load up a save that is at any time before completing the story. Then, just waste time however you can. You can sleep through the days, or just let your Xbox idle. If you have the coin, traveling by sea is fairly quick as well.

Either way, as long as you avoid the main story-line for as long as possible, you'll be good to go. the cut-off date is the 27th of Peraine, 1010. This is when the Orks will march to Thorwal, ending the game. You can check the date by hitting start.

As soon as you reach that day, the game will give you a short bit of dialogue, and then the achievement will pop.