Not really.
I actually find some of them rather pointless...
finish training in CoD 3...oh no, it took me like 5 whole minutes!
I will say, however, I occasionally look at what I can unlock and, if I remember when I'm playing, will try to do whatever it is.
For example:
There's a couple for CoD 2 for if you complete a level with bolt-action weapons only or automatic weapons only or german weapons only.
I like to do that for fun anyway, after i've beaten a game 3 or 4 times.
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