Achievements, aside from being a crippling personal addiction, are a great way to get an idea of the game you'll be playing before you play it. For some reason, they're always released a little ahead of the game to which they belong, and it's no different right now for Mirror's Edge: Catalyst.
The game's open world nature is reflected pretty well by the achievement list, one of the most promising aspects of the game, with several dedicated to completing sidequests within certain areas, in addition to the standard types of achievements we've come to expect, such as finding those always exciting collectibles.
You can check them out for yourself here. And don't worry, all the story-related achievements are marked as secret, so it's spoiler free.