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