Sins are actions that you must not do.
This article lists actions I find unworthy, gross, miserable or otherwise bad. My opinion is not a religion, so this list cannot be called a list of sins in the literal sense, but the whole vibe might be similar!
I try to avoid doing these things. I want others people to do the same. The list is always work in progress.
The list
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Impersonation
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Theft
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Murder
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Torture
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...
Exceptions
There are exceptions for every sin. I'm not ready or willing to list them all.
Well, for impersonation, there is a trivial exception: entertainment. It is alright to pretend to be someone else in a play or in a film. That's what they are about, after all. Think about the rest in a similar fashion.
Links
Alex has some observations on torture.