Suggestions:
"bounty"- hunt three (randomly determined) combos (Hunter/Smokey, Viking/Vulcan, etc.), three kills of each. The randomization could be weighted for active popular combos online. (The more common a combo is, the more it will show up in a random draw of three.) [Reward would be normal stuff/crystals]
"foxhunt"- "volunteer" (via "Red" paint at day roll-over, but it would have to be locked for the rest of the day) to be the fox in the fox hunt: mission is to place first in a DM of 30 minutes or longer. [Combo of "place first" mission, longer prerequisite (time) and the player-side knowledge that everyone is gunning for you, so a bigger reward]