You get this achievement by killing 100 creatures of any type.

Master Hunter Achievement

Kill 500 creatures.


You can use any type of weapon and kill any type of creature, including non-hostile mobs. It is recommended to kill crows. Not because they're especially easy to kill (which they are), but because they're just so darn annoying.

Note that killing mobs generated by spawners do not count toward this achievement. Killing mobs in a Pandora's Box event will count, however.