Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Alone in the Dark	Beat Catacombs in Solo.
Better Living Through Mad Science	Beat Biotics in Solo.
Big Trouble in Little Zedville	Kill a Husk with a thrown knife.
Blood Harvest	Beat Farmhouse in Solo.
Both Ways, Through Ten Feet of Snow	Kill a Fleshpound with only knives and pistols.
Bringing a Knife to a Chainsaw Fight	Kill a Scrake with only knives.
Bullets-For-Everyone Time	Get 5 kills while in Zed Time.
Cheap Shot	Kill a boss in Holdout in 1 shot.
Fashion Kills	Beat Paris in Solo.
Gunplay is the Best Play	Beat a map with only guns.
Holdout Bronze	Get 2000 points in Holdout.
Holdout Diamond	Get 10000 points in Holdout.
Holdout Gold	Get 7000 points in Holdout.
Holdout Silver	Get 5000 points in Holdout.
I Think I'm a Clone Now	Beat Biotics in Co-op.
It Slices, it Dices, it Flies!	Kill a Zed at long range with a thrown knife.
Just a Flesh Wound	Completely dismember a Zed.
More Hands Make Light Slaughter	Beat Farmhouse in Co-op.
Never Go Caving Alone	Beat Catacombs in Co-op.
Paris is for Lovers... of Carnage	Beat Paris in Co-op.
Stop Hitting Yourself	Dual-wield Zed limbs.
Throw the Grenade, Not the Pin	Blow yourself up with a grenade.
Up Close and Personal	Beat a map with only melee attacks.
You Ain't Got Time to Bleed	Revive your partner in co-op.
You Got Anything Harder?	Beat game on Hardcore (Hard mode)