I don't follow a 100% plant-based diet. However, bottom line? As long as you're eating a nutritious variety of plant-based foods, you can get plenty of protein.
OK, as aforementioned I do eat some meat--selectively, though. So I don't hear this as often as those who eschew all animal products would. However, in the light of the ongoing trending topics in regard to all things "plant-based food item," I thought it would be fun to lightly address the question...