Rampage One can be started soon after taking control of Trevor. The mission is started by approaching some rednecks drinking beer outside the "Liquor Market" west of Sandy Shores. Trevor asks for a drink of the beer. They begin insulting Trevor, this puts him in a rage!
To complete this mission you must kill 25 of the rednecks. However you need to kill 45 rednecks, destroy 2 vehicles and get 3 headshots for a gold.
All this with in 2 minutes
Best advice is to not hide, stay in the open. Trevor's health will be insanely high and he can take a large amount of damage.
You should use the grenades to take out 2 vehicles right away. Make sure to get 3 headshots.
Their is no need to run around, stay where you are, the rednecks will all come to you.
Don't stop shooting and Good Luck!