Here is the full list of all 19 Whiskey & Zombies Demo achievements.
Kill 50 Zombies
You slayed your first undead
Drink a botle of whiskey
Kill 15 zombies while drinking whiskey in a round
Unlock the secrets of the 80s
Your first melee kill
Kill 100 zombies with a melee weapon
Kill 1000 zombies with a melee weapon
Kill 10000 zombies with a melee weapon
Kill 100 zombies while drinking whiskey
Rescue a player from being a zombie
Drink 10000 bottles of whiskey
Get rescued from being a zombie
Kill 10000 zombies
Kill 1000 zombies
Kill 100 zombies
Drink 100 bottles of whiskey
Drink 1000 bottles of whiskey
Level 1 Successfully Completed!