A capture (or exchange) in chess is when you remove one of your opponent's pieces by moving your piece to the square that your opponent's piece was on. This achievement will most likely unlock within your first game of chess, however there is a very straightforward alternate way to get it. The following video will show you how to get this achievement along with two others:
-From the main menu, go to "Tutorials"
-Go to "En Passant Capture" (Page 7)
-Complete the tutorial by moving the pawn on e5 to f6 (you will need to press
to get through some tutorial boxes first)