Простой способ убить Библиотекаря (Достижение «Читатель»)

A simple way to get the achievement for killing a Librarian in the "Depot" chapter without wasting extra ammo.

What you need: at least 2 incendiary grenades.
First, provoke the Librarian so he starts walking towards you.
Second, wait until he stops and stands up to his full height.
Third, throw an incendiary grenade at him.

After that, the mutant will die quickly, and the achievement is yours!