Iron Crypticle

Lemons are one of the many different food drops that can happen throughout a run, and as you may suspect, this is completely random. This achievement unlocked for me naturally during my successful New Game run, without trying or putting any conscious effort into it. There's therefore not much I can say, since you have no influence on what food items drop, other than to say that you obviously want to ensure you pick up as many drops as you can, in general, just to be sure you don't miss any.