Quick Draw is an achievement/trophy in Metro 2033 and Metro 2033 Redux, awarded successfully defending Exhibition during the level Hunter from the nosalis attack by keeping the metal gratings intact. This is fairly easy to earn - simply shoot the nosalises attacking any of the 4 grates in the room before they break through them. Ignore the ones that drop from the ceiling. NPCs will deal with them.
Bronze Trophy - 30
On the level HUNTER kill the nosalises before they break through the ventilation grilles