How do I get platinum medals, I can't get any1. Do you need to do in each..

To access the platinum medal objectives, you need to get gold on the level, and you also need to complete the level on the 00 agent difficulty. You can tell if this is done as it will say underneath the level picture 'Platinum objective unlocked for 00 agents'. Now you have to do the level on the 00 agent difficulty again, and at some point in the level a platinum meter will appear in the corner of the screen. It might have a timer on it, meaning you have to finish before that time runs out, or it may have something different on it. You can pause the game and it should come up on the objectives list what you have to do to receive platinum. Hope this helps.

You need a certain amount of points.
The bond moments each give 10,000 points each, but you don't need them.

To get platinum get gold on operative then gold on agent and then gold on 00 agent to make it easier just get gold on 00 agent then do it again on00 agent and a platinum objactive will appear at the top right corner at some point in the level and if it has a timer then finish before that finishes or if it sais "in progress (00)" it means you have to not get hurt to much or don't get hurt at all to cheack what one press pause

All these people put paragraphs and use big words, let me sum it up with good detail. I'll be specific.. On single player, get gold on as many levels as you can. Once you start getting lots of gold of all the levels, you earn platinum. UNLOCKABLES !! Good luck sir or ma'am..