Quick Shot

The Quick Shot achievement is available during the Darkmoon Faire on Darkmoon Island.

Details
A Quick Shot is achieved by hitting the target with the green hunter's mark over it just as the mark appears. You have about 1 second after the mark appears to hit the target. Note that the mark can appear over the same target twice in a row.

To get this, wait until the current mark disappears then aim towards the middle target. As soon as you see any green mark appear, press 1 to begin firing immediately. There is a short cast time, so you can move the gun during the cast if the target is left or right.

A Quick Shot also counts for 2 points towards the daily quest.