Protein powder instead of meat.

Hello are there any major disadvantages of consuming protein powder instead of meat? I am a student so i live on really strict budget and protein powder is 3times cheaper than chicken breast. Ground beef and pork is cheaper but I don't like those two, cant make them tasty.

If I consume powder instead of meat should i buy some special vitamins? Or simple multi vitamin tablets are fine? I would eat fish/meat but most of my protein would come from powder