While I own Killing Floor due to the Potato Sack earlier this year, it is one of the games in my steam library that has seen little use (TF2 being my go-to multiplayer FPS).
As such, while the "The Big Hunt" achievement isn't flagrantly ambiguous (like some other achievements) I still haven't the faintest clue as to how to achieve it.
The Big Hunt - Kill a circus Scrake with a crossbow
Where can I acquire a crossbow (I assume from the in-game merchant?), and where can I encounter a circus Scrake? (For that matter, what is a circus Scrake?) Is there a particular level best suited to obtaining this achievement?