GTA 5 - Mission 70 "The Big Score" (Obvious Approach) 100% Gold Medal - Gameplay 

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Gold Medal Objectives
Headshots: Kill 20 enemies with headshots.
Time: Complete within 16:00.
Cha-Ching: Drop the gold on the train within 30 seconds.
Accuracy: Finish with a shooting accuracy of at least 60%.
Grand Theft Auto V, GTA V & GTA 5