Here you will find a guide on how to get the Gold Mission Rewards.
This guide will include all of the different objectives in order to get the Gold Rush Trophy / Achievement, which requires you to get around 70 Gold Rewards from various different missions.
MISSION 1) Outlaws From The West
1) Take no damage during the shootout
2) Loot 8 or more items from Adler Ranch
3) Complete With At Least 80% Accuracy
This one is not that difficult, the only issue may be getting the 80% accuracy. As for taking no damage, just stay behind cover and every now and then pop out and shoot a target.
For looting the 8 or more items, simply check all of the different cupboards and drawers, count each item if need be.
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