To complete this challenge, which is part of Chapter 2 "Forged in Slurp" mission, you will have to inflict a total of 500 damage points on enemies with common weapons. These are grey/white weapons — not to be confused with green weapons, which are uncommon.
This is the most frequent rarity of weapons. You will find them absolutely everywhere, especially on the ground. Paradoxically, you will have to avoid searching chests and supplies, containing too high rarity equipment for this challenge.
If you want to do it quickly, here's the best way to do it:
- Go to Team Rumble. You can relive endlessly and participate in many close fights to inflict tons of damage.
- Prepare your common arsenal (grey/white): sniper rifle, shotgun, assault rifle... so you will be effective in all situations.
- Fight!