The vast majority of people who play FIFA regularly will just get this in the course of playing, however, if you are just trying to get the achievement out of the way quickly, then I suggest the following:
First, from the the main menu of FIFA 16, go to the "Customize" tab, select the "Setting & Controls" tile, then the "Game Settings" tile.
From this menu use
to change to the "User Gameplay Customization" menu" - adjust the sliders in your favor (move error settings to 0, move speed settings up to a point which are comfortable with, max out "Goalkeeper Ability", etc.).
Now switch to the "CPU Gameplay Customization" menu & do the opposite to these settings (move speed to 0, error to 100, & especially set "Goalkeeper Ability" to 0, etc.)
(As a caveat, I actually found it difficult to get corners if I zeroed everything out, so during the course of gameplay I went back into the "Game Settings" menu & kept adjusting the CPU sliders back up until I found a nice spot to consistently get the CPU to "block" and "defend" in order to get the ball over the endline so that I could actually attempt the corner kicks.)
Regardless, after the sliders are set to your liking navigate back to the main screen, move over to the "Play" tab, "select "Kickoff", select the teams you wish to use (my suggestion is use Barcelona & then some 1/2 star team from England or Ireland). I suggest you change the "Game Settings" before selecting "Play Match", just set the "Difficulty Level" to "Beginner". I set the time to 20 minutes (the achievement will pop as soon as you get the second goal), so that I had plenty of time.
As I stated above I found it hard to actually get the ball past the endline off the opposition, so it took a bit to get the corner kick opportunities. Even with the sliders in my favor it took about 7 corners (and a little over a full half at 20 minutes) to get the achievement. I found it easier to run to the endline and then back at defenders to get them to kick the ball over the endline & get the corner opportunity rather than trying to get the keeper to "deflect" a shot away.
As a note: you definitely don't have to score (i.e. bend it like Beckham) directly from the corner itself.
All you need to do is score from two different set pieces from either corner. Header or kicks are ok. Deflections into goal are fine. I've also been told that rebounds and clearances that come from the corner & then you score from also unlock the achievement, but I haven't verified that personally.
Again for most FIFA players this will be trivially easy or will come during regular game play.