How to Get the 'Hide and Seek' Achievement in Batman: Arkham City

Another great thing about Batman: Arkham City? The rogues gallery! Every great villain from Batman's history shows up in the game, and it's always awesome when they do turn up. Even Mr. Freeze, my least favorite of Batman's enemies, is kind of cool in the game (see what I did there?).

To get the 'Hide and Seek' achievement, you have to knock Mr. Freeze into next week. But how? Well, there's four main weak points on him that you can only exploit once. Beat the snot out of him, and you'll get the achievement, and advance the story.