To get this achievement you must complete all rampages in the game.

Rampages can only be done with Trevor, there is 5 in total and are marked as an orange skull on the map. Below I have provided how to achieve gold on all 5 missions:

Rampage 1:
45 Kills
3 headshots
Destroy 2 vehicles

Rampage 2:
45 kills
6 headshots
Destroy 2 vehicles

Rampage 3:
50 kills
6 headshots
Destroy 2 vehicles

Rampage 4:
45 kills
6 headshots
Destroy 2 tanks

Rampage 5:
30 kills
10 headshots
Destroy 2 vehicles