Complete the indicated task to unlock the achievement.

Achievement	How to unlock
A master at my skill	All challenges completed.
A walk in the park	Completed a level on first try.
Bringing out the dead	100 enemies killed.
Death does not become me	Unknown.
Done and done!	All weapons and upgrades unlocked.
End of the week	Game completed.
Everyone is sleeping	10 000 enemies killed.
First come, first served	First enemy killed.
Good night, good luck	Second day completed.
Hard Boiled	Complete first day without dying.
It is a massacre	1000 enemies killed.
Just another day	Complete the first and second day without dying.
Knock knock who's there?	Unknown.
No need to slowdown	Completed a level without slowmotion.
Recycle!	Unknown.
Suspended in time	One hour in slowmotion.
The Boss has been fired	First boss completed.
The Journey begins	First level completed.
This is my gun	First weapon unlocked.