Achievements:
Achievement How to unlock
A Bit Much? Collect 100,000 XP
Abraham Lincoln Cheeseburger Hunter Kill 25 Sentient Cheeseburgers
AI, Shmay-I Kill 10 Robots
Anti Theft Device Kill a Burglar
Armor Piercing Kill 25 Fat Army Privates
AWOOOO! Kill 10 Werewolves
Beware the Fangs Kill 5 Vampires
BEWARE THE GENERAL Kill The General
Big Boss Man Kill every boss
Bindle of Joy Complete all Hobo Colony levels
Blue Belts Kill 150 Karate Klutz
Blue Good, Red Bad Kill 150 Robots
Brainy Play as every scientist
Bushes Clear Kill 25 Commandos
Catch 'Em All! Play a level as each character
Certified Badass Kill 5,000 monsters
Check The Bushes Kill 5 Commandos
Count to 250 Kill 250 Vampires
Cursed Vests Kill 5 Fat Army Privates
Divide By Three Kill Private Corpsepile
Drunk Tank Kill Zombilly
Dumpster Diver Kill The Turtle
Earn Your Whiskers Kill 500 Werewolves
Embarassment of Riches Collect 25,000 XP
Enlightened Peaceful Warrior Kill 25,000 monsters
Exit The Dragon Kill Beelsteambub
Fancy Beast Kill a Crazy Cat Lady
Fire Drill! Kill 5 Charlies
French Connection Play as both Joan of Arc and Napoleon
Girl Power! Play as every female character
Gold Digger Open 50 chests
Heavyweight Champion Kill Mad Mulligan
Hobo Conquerer Kill 100 Zombie Hobo Warriors
I Know Kung-Fu Kill a Giant Karate Klutz
Keep Your Head Kill an Amazing Head
Love Connection Play both Caesar and Cleopatra
Menace to Undead Society Kill 1,000 monsters
Mind Rays Avoided Kill 25 Zombie Alien Hybrids
Monster In The Depths Kill The Mallrog
Mulligan's Not So Merry Men Kill 5 Zombie Hobo Warriors
Newbie Beat the first level
No Dancing! Kill a Blood Top
Nosey Nelly Open 100 chests
Not So Heroic Play as each of the less reputable Heroes
POWER! Collect 50,000 XP
Puke Dodgeball Kill 25 Fast Food Fatties
Queen Slayer Kill Mama Nibbles
Reclaim Trashcalibre... Again Kill Johnny Hollowlegs
Rockin' the Flannel Kill 100 Werewolves
Safe Cracker Open 10 chests
Seriously? Kill 5 Super Heroes
Sight Unzeen Complete all Bunker levels
Spice of Life Kill one of each specialty monster
Stake It Kill 50 Vampires
Survived The Lists Kill 25 Roach Knights
That Burger's Got Bite Kill A Sentient Cheeseburger
That The Best You Can Do? Collect 1,000 XP
The Doctor Is Out Kill Dr. Neirzeit
The Princess Won't Approve Kill The Walrus
The Shopping Maul Complete all Mall levels
There's Aliens In This Game? Kill 50 Nibbles
Tricking 'Em Out Collect 10,000 XP
Up Close And Personal Play as each melee character
Use Your Arms! Kill 20 Karate Klutz
Victory is Mine! Kill W.A.R.D.
Watch Out For Colons Kill 10 Body Parts
Welcome to the Gun Show Collect 5,000 XP
WOO WOO WOO Kill 5 Goats
Written by the Victors Complete every level in the game
You're A Machine! Kill 10,000 monsters
You're Getting the Hang of It! Kill 50 monsters
You're Strong. We Get It! Collect 200,000 XP
Zombie Hunter Kill 500 monsters