Overwatch 2

An easy map to do this on is the map Nepal as there is a giant hole on the side of the objective. You could wait in the room right next to it and when two people are trying to capture it you just use your super and its almost a guarantee push off

Enemies tend to crowd together on bridges on Lijiang Tower, likely behind a Reinhardt shield. Lucky for you, Whole Hog easily breaks Reinhardt's shield too, and enemies who were behind it can be pushed back after Reinhardt's shield is broken. Aim for hitting them off the edge of the bridge, and it should kill at least 2 enemies. I got Play of the Game because of it, and here's the clip.

Here's how we got it:

1) We unlocked this on Ilios in Control mode. Choose Roadhog and make sure to play in Quick or Competitive modes (not Arcade or Tutorial).
2) Most of Ilios' control points have a place to knock enemies of a cliff -- A point has a well in the centre, but B point is probably best. The control point is in a room with three entrances that open up to a narrow ledge. Play normally until you've charged your super, Whole Hog.
3) Wait until enemies are in the face of either of the three entrances (not the fourth, which opens up to the courtyard) and hit the Y button to unload.

The Achievement will unlock when two enemies are knocked off the map with your super.

Voila! Here's how it all looks, keeping in mind we made the video using XboxDVR.com, so the Achievement doesn't actually pop on-screen.