The Going Ape Achievement/Trophy is quite simple to unlock and can be done in "
Single Fight" - "
Versus" or "
Online Private Match".
Simply load up one of these game modes and select "
Gorilla Grodd" in the character menu then select "
Metropolis: Ace o' Clubs". When you spawn in, make your way to the far left of the map and you will find 3 Barrels which you must throw at your enemy with R1 (PS4) or RB (XB1).
Here is a video guide if you prefer it over written guides