Orcs Must Die!

First of all gibbing an enemy means that they get cut into lots of pieces.

List of things that Gib enemies in order of unlock
1.Wall blades
2.Clockwork Mace/Swinging Mace
3.Grinder
4.Exploding barrels

Spike floors and paladins also count but it is alot less liky for them to gib the orcs.

If you use the clockwork mace as much as i did you should easily get this by the end of the game.

If not load up the level The Bridge. Pick the tar trap, barricade, swinging mace and anything else you want. Block of one of the hallways on either side and place a swinging mace under the bit in the middle with tar traps to slow down the orcs while they go under. Now all the orcs from the side you blocked off will have to go through their. Most of them if not all from that side will die from going under the mace, now just make sure the orcs dont get through the other side or destroy the barricades as they did to me once.

Having the upgrade for these would make it easier but not necessary.

Ofcourse the earliest level you can get this is Lunch break when you first unlock the wall blades.

If i missed something please tell me so i can fix it

Here is a video guide of one way to do it.