joined vip tops to earn

The pie chart is just to represent ways you may have previously earned credits. The percentage could change depending on different offers you take part in. Basically that just means that currently VIP rebates make up 3% of the total number of credits you've
earned since joining the program.

Thats not how its worded, i cant earn multipal credits, in this case i earned none.

"may not earn Rewards

Credits for multiple offers based on performing the same action"

If i had earned credits by completing a mission then that's reasonable, the my VIP would be earning credits twice for the same action. in this case as they where not earned form that action they should be earned for the my VIP.

I believe it represents a list of "VIP badges" you have earned since signing up for Xbox Rewards. Under my VIP badge, it has the number '5', as I have 5 VIP awards. Somewhere on the page, there is a link the VIP awards listings and how you would have earned
them. I don't believe there is much relevance to this, just for fun I guess.

Currently there is a glitch on the site which is showing that you wouldn't have earned anything. Once the glitch is fixed, you'll be able to see anything you've earned since joining. Keep in mind that in order to receive credits, your purchases either have
to be eligible for a specific offer on the site at the time, or you need at least 1 star level in order to receive VIP rebates. There are generally no offers to receive credits just for playing or earning achievements although there are offers here and there
that will offer credits if you purchase a game for that offer and then earn a specific number of achievements in that game.

Support will check on your VIP status (you need 1 star level to start earning VIP rebates). But as of July 1, 2014, there are no offers to receive credits for renewing gold.

Achievements will only earn credits if they are part of a specific offer on the site at the time. Generally the offers include having to purchase a game specific to the offer and then earning a certain number of achievements in that game.