What advice would you give someone who wants to be sure he gets all of the required amino acids

If I were you I would eat less plant based foods because they automatically don't have all the amino acids you are looking for. Stick to more proteins because proteins break down into amino acids. Nuts, peas, beans, and whole grains have more total protein than fruits and vegetables.
If you follow the standard health food plate you can easily boost your amino acid intake if you eat the right foods!
Try eating more meat, fish, poultry, eggs, dairy products, and any type of grains.