Portal 2 has a nice selection of regular story-driven rewards, along with ones for doing abstract actions in the campaign (such as finding certain Easter Eggs), as well as a nice helping of co-op Achievements/Trophies.
We’re going to bypass showing you the ones you’ll automatically earn as you finish the campaign or the co-op levels. You’ll earn these as you play anyways, so we’ll focus our attention on the ones you’ll find 'off the beaten track' as it where.
They’re organised in the order that you’ll come across them in the campaign or the co-op mode. We’ll also detail which chapter and chamber you need to be in to get it. Let’s get started!