Comet
Not unlocked yetWin a Long Game on Icebreaker on Hell on Earth Difficulty.
Daytrip
Not unlocked yetWin a Long Game on Mountain Pass on Normal Difficulty.
Gone Camping
Not unlocked yetWin a Long Game on Mountain Pass on Hard Difficulty.
Mountaineer
Not unlocked yetWin a Long Game on Mountain Pass on Suicidal Difficulty.
Park Ranger
Not unlocked yetWin a Long Game on Mountain Pass on Hell on Earth Difficulty.
Neighborhood Watch
Not unlocked yetWin a Long Game on Suburbia on Normal Difficulty.
Private Security
Not unlocked yetWin a Long Game on Suburbia on Hard Difficulty.
Vigilante
Not unlocked yetWin a Long Game on Suburbia on Suicidal Difficulty.
SWAT
Not unlocked yetWin a Long Game on Suburbia on Hell on Earth Difficulty.
Slight Drip
Not unlocked yetWin a Long Game on Waterworks on Normal Difficulty.
Burst Pipe
Not unlocked yetWin a Long Game on Waterworks on Hard Difficulty.
Pressure Failure
Not unlocked yetWin a Long Game on Waterworks on Suicidal Difficulty.
Floodgate to Hell
Not unlocked yetWin a Long Game on Waterworks on Hell on Earth Difficulty.
Piece of Cake
Not unlocked yetComplete all new map achievements on Normal Difficulty.
Pound Cake
Not unlocked yetComplete all new map achievements on Hard Difficulty.
Fruit Cake
Not unlocked yetComplete all new map achievements on Suicidal Difficulty.
Devil Cake
Not unlocked yetComplete all new map achievements on Hell On Earth Difficulty.
Let Them Burn
Not unlocked yetGet 1000 points of burn damage with the MAC-10.
Walking in A Winter Horror Land
Not unlocked yetWin a Long Game on Santa's Evil Lair on Normal Difficulty.
Silent Night, Evil Night
Not unlocked yetWin a Long Game on Santa's Evil Lair on Hard Difficulty.
I'm Dreaming of a Red Christmas
Not unlocked yetWin a Long Game on Santa's Evil Lair on Suicidal Difficulty.
Grandma got Eaten by a Reindeer
Not unlocked yetWin a Long Game on Santa's Evil Lair on Hell on Earth Difficulty.
Merry Friggin Christmas
Not unlocked yet[2010 Xmas] Kill the Christmas Patriarch.
Cracked the Nutcracker!
Not unlocked yet[2010 Xmas] Land the killing blow on a Christmas Fleshpound with a Knife.