SCAVENGE HUNT - 15G
Stop the enemy team from collecting any gas cans during a Scavenge round

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If you're playing online this may take some practice, just keep attacking the survivors and stop them from getting back to the generator.

System Link Method:
Once you enter the game leave the guest account or a friend in charge of the other team. You can either attack them or just sit around waiting for the round to end. If no cans are collected the achievement will unlock.