Welcome to the walkthrough for Call of Duty 3, one of the games from the series's "good old days". There's not a whole lot to say about this game to prepare you in advance; it's one of the early WW2 first-person shooters, so there's a good chance you're going to get used to this game very quickly.
Earning all of the achievements should take about 60 hours at the larger extreme, as the boosting process for the multiplayer achievements does take a while. The campaign can take up about 20-30 of those hours if you're having a particular amount of trouble with it. There are some key factors to completing the campaign on Veteran that you need to be aware about, but that'll be mentioned on its page in the walkthrough.
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