Yes of course you can. Everyone who buys a PS3 and does not get a online connection installs the game they purchased at the stores and then plays them offline.
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You can only install the downloadable ps3 games via the online store. no you can't you can do it by putting the CD in the ps3 console go to download go to download game and WA la
my frend got divx from fifa 09 even though he doesnt have a computer
You can not play Computer games using the PS3. The PS3 is not a computer in the sense that it is not able to and does not contain all the software present and needed to play computer games that can be found in a laptop or PC.
Yes, you do get achievements! These achievements can be found in games that you play, online, and offline. These achievements can be viewed in your achievements section.
Portal 2 is a co-op game rated E10+