Feats of Strength
If the past three pages of achievements have you thinking it'll take about ten years to earn all of them, the Starcraft II feats of strength achievements will provide a welcome relief. These are little more than little bonuses Blizzard tossed to players, and there are only a few you can actually work towards unlocking.
Let's start with the feats of strength achievements you can unlock in multiplayer. There's are a number of Top 8 achievements for finishing a season in the top 8 (out of 100) spots in a league. This one didn't go into effect until season 2, but we can expect to see more of them going into future seasons.
"Hot Shot" is more challenging, and you don't get many chances to get it right. You have to finish a qualification round without losing any matches, and if you lose at least one match in each qualification round, you'll have to wait until the next season.
There are, of course, the requisite "pay Blizzard money" achievements. All right, they're actually called "Devoted Fan," "Cataclysmic Devotion," and "BlizzConqueror 2011," but "pay Blizzard money" is more accurate. You can only unlock these if you purchased the collector's edition of SC2, the collector's edition of WoW: Cataclysm, or tickets to Blizzcon 2010.
The last are unlockable in the campaigns, and there's no good reason for them to be in feats of strength other than being particularly difficult to unlock.
Kill all Zerg structures in The Devil's Playground on normal to unlock "The Scenic Route." Doing the same to the Protoss in Welcome to the Jungle gets you "You're So Crazy!" The last one will probably take a few attempts, but you have to lure the Brutalisk in Piercing the Shroud back to the A.R.E.S. and kill it with the machine.
A few more that probably should have been included were "Red Lobster" from The Devil's Playground, where you kill the Bbrutalisk with rising lava, and "One Shot, Fifty Kills!" from Belly of the Beast. The name says it all for that one.