Chickpeas and pinto beans, legumes in general, are a decent source of iron. Lentils just happen to be the best legume, and pretty much best veggie overall.

It's definitely possible to get all nutrition from an intuitive diet, preconditions are a) having been exposed to enough different foodstuffs, b) not being addicted to junk food and c) a habit of cooking from scratch and follow your gut when planning meals. B12 really is the critical thing for vegans as non-animal sources are indeed very rare. There's a nutritional co-processor somewhere in us we wouldn't be here if we didn't have one. Also pregnant women couldn't suddenly crave pickles with Nutella without one. The trick is actually using it.