Thread update
===========
For whatever reason, sometime after posting the above reply, I started thinking if there was a way to include drops such as the alchemical hydra heads in one of the goals, and then it dawned on me: I'd completely forgotten about trophies. In the Witcher series, witchers always take something from the monsters they slay for contracts as proof of having killed the monsters, which are usually the monsters' heads... kinda like the various head drops in Runescape!
So with that in mind, I've now replaced the goal #8 to be about them instead. More information will be put out when I next time receive such a trophy! > )