|Completed a Gold- or Silver-tier Challenge while countering at least 25 times|
This is pretty simple. Just keep track of your counters and make sure you get to 25 before completing the challenge. It doesn't all have to be on one wave, just as long as they're all done before you complete the challenge. I did this on the silver rank of the first challenge with no problem.
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User Score is based on 150 user ratings.