Complete the indicated task to unlock the achievement.

Achievement	How to unlock
A Key moment	The key to everything, and then some.
A shimmer in the darkness	Find all parts of the golden gun.
A surge of deepest satisfaction	Defeat the cellar inhabitant.
Can't touch this	Kill 50 enemies without getting hurt.
Can't trust anyone	Prevent the looter from obtaining a weapon.
Club of 100,000	Score 100k in survival mode.
Collateral Damage	Destroy 2,000 environment objects.
First Steps into the Rain	Reach the end of the first level.
Flow with the current	Survive the electric chase.
Guns without Brains	Obtain automatic guards for the village.
Industry-scale harvesting	Shred 100 monsters with the harvester.
It must be Art	erm... what?
Just like when I was young	Survive the ambush at the schoolyard.
Less human than expected	Eliminate the threat in the laboratory.
Light up the dark	Bring the lighthouse back to life.
Lord of War	Upgrade all weapons to Max level.
MO-MO-MONSTERKILL!	Achieve a x20 multiplier.
Not known for their wits	Dissolve 5 zombies in acid.
Nothing in common but the enemy	Allow the looter to live.
One more layer between them and me	Find all pieces of the flak jacket.
Public transport madness	Survive the subway journey.
Put an end to this	Finish the story.
Reasonably well armed	Acquire all weapons in story mode.
Salvage what's left	Help the refugees at the factory.
Secret Cave	Find the secret cave behind the bushes.
Seven at one stroke	Blow up 7 enemies with a single explosion.
SKiller	Defeat a boss with just the pistol.
Spare a dollar?	Find $5,000.
Survival of the Unfit	Help all 6 park defenders to survive.
Survivor	Score 50k in survival mode.
The crawling disease	Survive the worm invasion.
This is Madness!	Score 250k in survival mode.
This madness had to stop	Finish the story on "maniac" difficulty.
Ultrakill!	Achieve a x10 multiplier.
Where even light failed	Solve the village's insect problem.
Wrecking ball	Defeat a boss without getting hurt.