Warhammer 40,000: Dawn of War II

The Last Stand was introduced in October 2009 and updated in Chaos Rising to include these two new commanders. This is basically a survival mode where you and two other commanders have to hold off against waves of enemies. Getting this isn't that hard just make sure you keep hold of the control points and that your team mates stay alive. This will keep your score multiplier up and make this pretty easy.

It's possible to get the score by wave 9. This may take a bit of practice but you'll easily get it going for the other two last stand achievements.