I'm trying to get the Ironman achievement, but have not been able to get far enough.

For a while, I was trying Farmers, because the herbalism and gardening can cover healing, food, and stat boosts.
But they don't seem to have the Boom needed to survive at deeper levels.

What have other folks done to make this happen.

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Also, are the any hidden gotcha's? Text makes it sound like you need to go down the stairs once you see them, but I was unsure if that is enforced or not.

Thanks!