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I have completed campaign and found only 7 upgrades.
For this one you only have to carry it to the earlier half of "When in Rome". After you complete the battles following the river, instead of going up the stairs, go to the far end of the dirt road. There's a 1 HP pill there. Pick it up to trigger a secret Kamikaze trap - and immediately fire the nuke. This will net you 140 kills with almost no effort. Achievement unlocked!