Christmas Slay Spill 10,000 gallons of blood
You must unlock it between
December 16, 2013 - December 24, 2013 (7:00pm Eastern time [-5 GMT]
shockingly there is a gallon per a zombie so
10,000 kills you can kill them fastest in combo cars (best is Rollerhawg) but the fastest way is to drive around the first "block" (left top corner of the map "Ingleton") where Elli's Mechanic Shop is
(Credit for image/route goes to
JACK LAYT0N)
This should take no more than 30 minutes if you have the attribute for indestructible cars (Under Mechanic at the very end)
If you don't have Indestructible cars just spawn a new one from the shop when yours starts to smoke badly
After you unlock the achievement Congrats you now have a
Reindeer Hat in your locker
Happy Killing