BEFORE GOING FOR THIS IT IS RECOMMENDED THAT YOU GO TO THE MAIN MENU AND MAKE A COPY OF YOUR SAVE SO YOU CAN DO BOTH OPTIONAL PATHS WITHOUT RESTARTING THE ENTIRE EPISODE.
This achievement is gained during Act 2 after choosing to go Hunting
. The Hunting section has two contradicting achievements, so make sure you back out after completing this to get the other. Once you gain control of Clementine, speak to Aasim who will ask for help hunting rabbits. He will hand you a crossbow and you will need to succesfully kill 2 rabbits without missing a shot. Use your cursor to aim over the rabbits and RT to fire the arrow. Keep in mind that the rabbits hop from left to right as the scene comes up. The following missable achievement can be seen in the video below at 8:34
If you miss a shot, immediately back out to the main menu and re-enter the game to have another try at doing this. Unfortunately, you will need to listen to about 3-4 minutes of dialogue for every attempt.