Lost Viking: Silver

Awarded for achieving a score of at least 250,000 in the Lost Viking minigame.

Source: I personally achieved this, though my laptop isn't taking screenshots for some reason. Fn + Home(Prt Sc) isn't working for some reason, like it does for WoW, but I did get this achievement.

Here's a link to another page that backs verifies. 2nd paragraph. http://sc2musings.blogspot.com/2010/07/guide-to-lost-viking-minigame.html