The order I got the achievements is not forcibly the order anyone else has to get them. Except for the story related ones, you can get them in any order you like, but there are only a few places you can get some of them.
I will separate this walkthrough into 2 parts: the campaign and the online multiplayer. Both need to be done for the full 1000 on this game but they aren't too tough to complete.
I will also try to give a detailed description of the way I went through the campaign, so that you don't have to search too much for a solution for some of the puzzle segments (which aren't too many to be honest).
This game has 1000 gamerscore, needs at least 2 playthroughs, and takes approximately 20-25 hours to complete.
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