Pretty much every whole food contains every essential amino acid, you just have to be careful with overeating certain grains like wheat and rice which are low in one or two specific aminos and overeating fruit which is low in protein in general. If you specifically want high protein you eat lots of legumes, nuts, and non starchy vegetables (especially dark leafy greens like spinach and kale). If you want really crazy protein go for stuff like tofu and other refined products.