GIBZ achievements

[Halloween] Smash 100 Pumpkins (unlocks the Pumpkin Head)

Cut off 1,000 limbs with the Bone Chainsaw

[Base Defence] Unlock everything under the Building Tree

[Xmas] Get a Snowman Head

Kill a total of 25,000+ enemies

Kill a Crusher by only hurting it with it's own rocks until it gets angry, then proceed to not take any damage from it (unlocks the Dark Crusher Mask)

[Base Defence] Have a Boss reach 0 health without a single player damaging them

[Halloween] Eat 200 pieces of candy (unlocks the Witch Hat and Nose)

[Base Defence] Don't let a single chicken damage anything during a wave of chickens

Unlock all hats and facewear

[Base Defence] Have 4 fully decked out Survivors in your base

[Base Defence] Clear 200 Waves