Mass Effect Achievements

To obtain renegade, you need to be more aggressive or dark. In conversations, you can gain renegade for saying an intimidating line. Another way to obtain renegade is by doing "aggressive" or "dark" actions. For example, if you are given the option to do a dirty deed for someone, you can obtain renegade. Once you obtain enough renegade, (which took me about my whole playthrough) the achievement will be unlocked.