Firebug

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Using only Inferno towers, Win any Chapter 4 (or later) mission.

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This achievement requires that you win any Chapter 4 or later mission using only Inferno towers. While most of the maps can be won this way, the easiest approach is likely to play Chapter 19 in Grinder mode on easy and play only Inferno towers. Ensure you create a long path and consistently upgrade your towers for an easy win. Note that you do not need to get a gold (or any) medal to unlock the achievement, you merely need to finish the game with at least one core still on the map.