Console Cheats :
When in game, press the ` button to bring down the console and type :

heal - for full health
god - god mode (type again to off the god mode)
fly - fly in air
setgravity - adjust the gravity
walk - disable noclip mode
allammo - max ammo
ghost - noclip mode
slomo # - set speed, disable after ZEDtime
behindview <0> - enable third person view


Achievement :

Alligator Farmer - Survive a long game on Farm map on Suicidal mode
Cattle Farmer - Survive a long game on Farm map on Hard mode
Chicken Farmer - Survive a long game on Farm map on Normal mode.

Emperor of the Manor - Survive a long game on Manor map on Suicidal mode.
Duke of the Manor - Survive a long game on Manor map on Hard mode.
Lord of the Manor - Survive a long game on Manor map on Normal mode.

Lab Professor - Survive a long game on Biotics Lab map on Suicidal mode.
Lab Assistant - Survive a long game on Biotics Lab map on Hard mode.
Lab Cleaner - Survive a long game on Biotics Lab map on Normal mode.

Mad Boss - Survive a long game on Offices map on Suicidal mode.
Hard Boss - Survive a long game on Offices map on Hard mode.
The Boss - Survive a long game on Offices map on Normal mode.

Suicidal Pub Crawl - Survive a long game on West London map on Suicidal mode.
Hard Pub Crawl - Survive a long game on West London map on Hard mode.
Pub Crawl - Survive a long game on West London map on Normal mode.

Experimenticenticide - Kill 100 monster.
Experimentimillicide - Kill 1,000 monster.
Experimentilottacide - Kill 10,000 monster.

Fascist Dietition - Kill 200 Bloats.
Homer's Heroes - Kill 100 Sirens.
Bitter Irony - Kill 2 Scrakes with Chainsaw in a single wave.
Hot Cross Fun - Kill 25 burning monster with a Crossbow.
Careful Spender - Kill 4 monster with a single shot from Hunting Shotgun.
Dignity for the Dead - Kill 10 monster feeding on dead teammates corpses.
Social Outburst - Kill 8 monster with 1 grenade.
Straight Rush - Kill Patriarch before he can heal itself.

I Like To Watch - Obtain 5 min of ZEDtime.
Mr. Perky - Obtain all of your perks to level 5.
Philanthropist - Donate 1,000 Pounds to teammates that have 50% or less money than yours.
Master Surgeon - Play as Medic and kill 8 monster using knife in a single wave.
Self Medicator - Heal yourself 100 times with syringe in Co-op mode.
The Hard War - Complete a long game on all 5 maps with Hard mode.
The Long War - Complete a long game on all 5 maps with Normal mode.
Thin-Ice Pirouette - Survive 10 waves when all your teammates has died.