Defense overload achievment on steam

does anyone know if the steam achievement defense overload has to be done on one character or does it work by adding up all your characters defense constructions?

Every achievement has to be done on one character.

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this ones gonna take a bit huh unless i lower the difficulty and it makes the towers cost less?

iirc, construction cost is the same
but, first construction cost is the cheapest, rank 1 tower is the cheapest
so build 4 rank 1, complete a set of waves, cash out, restart/don’t start from checkpoints(so towers clear) then rinse repeat building rank 1 towers
shouldn’t take long to get the achievement that way