Killed the Machete Slinger boss

Earn a total of £50,000

Kill a total of 25,000+ enemies

Amputate 8,000 zombie arms

Shoot off 5,000 pairs of zombie legs

Decapitate 10,000 zombies

Kill 600 enemies with sidearms

Kill 2,500 enemies with shotguns

Kill 2,500 enemies with single-shot rifles

Kill 2,500 enemies with auto-rifles

Kill 2,500 enemies with melee weapons

Kill 1,000 enemies with Supa Shotguns

Kill 1,000 enemies with Supa Snipers

Kill 1,000 enemies with Supa MGs

Kill 500+ zombies in a single round of Mayhem (singleplayer)

Open 300 crates

Unlock every weapon

Unlock all perks

Max out all stat buffs

Play Zombie Surfing 10 times

Give the Machete Slinger a taste of his own medicine (unlocks the Bloody Metal Mask)

Repel a lot of zombies (unlocks the Plague Doctor Mask)

Use the Lever-action rifle to teach some big monsters a lesson (unlocks the Black Cowboy Hat)

Die a lot (unlocks the Tall Top Hat)

Found and unlocked the Taller Top Hat

Unlock all hats and facewear

Dig 750 holes

Win a game of Defence without taking any damage

Have 30+ maggots on you at once

Find a great photo opportunity

Hit back 262 projectiles (unlocks Baseball Bat)

Kill 1,000 enemies with explosives (unlocks Mining Helmet)

Cut up a bunch of fish (10) in a row without being hit by one (unlocks Headband and Blindfold)

Chop down some stumps (unlocks Wood Axe)

Hit a stick of dynamite 7 times back and forth with a friend

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)

Cut off 1,000 limbs with the Bone Chainsaw

Clear the Tower Bridge

Clear the Tower Bridge, having all the bosses chasing you at once

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

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

[Xmas] Get a Festive hat off a Zombie or a Friend (unlocks Santa Hat)

[Xmas] Find and collect the Antlers off the "Deerwolf" (unlocks Antlers)

Beat the final boss having never lowered the difficulty below EASY on that character

Beat the final boss having never lowered the difficulty below NORMAL on that character

Beat the final boss having never lowered the difficulty below HARD on that character (unlocks Broadsword)

Beat the final boss having never lowered the difficulty below HARD or spent any money on that character (unlocks Dark Knight Helmet)

Kill 10 zombies with one shockwave in Zombie Surfing

[Halloween] Go Trick-or-Treating wearing a Halloween themed item

[Halloween] Find and unlock the Spitter and Werewolf Masks

[Xmas] Get a Snowman Head

[Base Defence] Clear 20 Waves

[Base Defence] Clear 100 Waves

[Base Defence] Clear 200 Waves

[Base Defence] Unlock everything under the Building Tree

[Base Defence] Unlock everything under the Survivor Tree

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

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

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