The current ones are from the D:OS Kickstarter campaign: the green K being the base one and the others being for other tiers (I forget which one(s) I qualified for, I just like the green K!) And then there's the Larian employees' badge and a couple of others for e.g. mods and admins.
Thank you. And the mighty weresheep badge?
Edit: I see that LordCrash has already explained it. Thank you both