Quote from: Blizzard (Source)Achievements
Player achievements and statistics are now viewable on Armory character profiles. These new pages are power leveling designed to appear and function much like their corresponding interface in-game, with some additional features unique to the Armory.

To navigate between categories, simply click on the category or subcategory name on the left-side menu.
The ability to compare achievements and statistics between multiple characters is expanded to allow you to compare up to four characters, even across realms.
To compare multiple characters, simply click the tab labeled ¡°Add Character to Compare¡± at the top right of the Achievements or Statistics interface. Enter the name and realm of the character you wish to compare to the one you are currently viewing. The second character¡¯s portrait and achievements will appear next to the original one. You can add multiple characters in this manner, and can compare up to four characters at one time.

Wrath of the Lich King: Armory Design Changes
The Armory has undergone changes to its design, affecting its overall look and functionality. Here are some of the notable changes:

The main Armory page now has a new, more streamlined look. A news feed displays recent Armory news as well as region-first achievements. After logging in, the news feed also displays realm-first power leveling achievements on the main character¡¯s realm.
Armory logins now persist for two weeks before expiring, and closing the Armory window no longer logs out of the Armory.
New drop-down menus under the main search field direct you to common search categories, such as for Arena rewards from a particular season, items from tradeskills such as gems and glyphs, and so on.