Brotato

For this achievement, the 10 Ranged Damage is straightforward - pick level-up bonuses and items that increase Ranged Damage. What might not be clear is what it means by "structures." To my knowledge, this just means turrets. I'm not aware of any other types of structures you can get in this game other than the purple item Tyler, which I believe also counts as a structure. Turrets are way more common though, so simply buy three turrets from the shop between waves, and simultaneously increase your Ranged Damage to at least 10, and this achievement will unlock immediately.