You only have the accusation. From reading acts 15 we do note some did go out from the Jerusalem believers and did indeed stir up the troublesome message among the gentiles that Paul is addressing. You also have that message was not sent or authorized by those in authority. Therefore in light of Peters stance in that council what you don't have is that "Peter" was actively involved in what Paul accused him of. "Forcing gentiles to adhere to the full law of the jews for righteousness sake"There we have it. Peter sinned, as all Christians do.
But like Paul I see all the law as law and Paul considered the law in judgments he made such as, "For Scripture says, “Do not muzzle an ox while it is treading out the grain,” and “The worker deserves his wages.”
We use the NT as a guide as to which broken commandments can still lead to death.
For example as one who knows Jesus I would state forbidden sex acts in the law qualify as sexual immorality.
Yet also as one who knows Jesus I would state I don't need to keep a sabbath day as in the law that is a complete absence of work with even meals prepared in advance.