Going to be frank, this game's medium badge is awful.? Seeing as most of the variables seem server-side, the best I could do is set up a script for AutoHotkey to play the game for you.

http://www.autohotkey.com/

Before you can actually 'bot' the game, join an alliance.? Send applications to every alliance you can, just get into one.? If you get 30 suns, spend it on one of the items that have huge stats (~200 attack / defense), it will up your damage by quite a lot.

If you need a lot of credits, PVP with your energy.? Fight one opponent, and if it gives you a few thousand credits, keep fighting them.? If it only gives a few hundred, or you lose, stop fighting them.? Once you find the opponent that pays heavily, fight them the 10 times you can.? Some very powerful opponents can give up to 10,000 credits a fight, making an easy 100k.

For the script, because it depends on screen size and all that (for coordinates at least), here's the locations you need using AutoIt3 Window Spy:

click 1 button in fight
heal
click okay for heal
slot 1 (in the raid tab, the first fight)
slot 2
slot 3
close battle (during the fight, closes battle to return to raid screen)
ok button to level up
X button for not enough (X button for the occasional error, try spending more energy than you have)

Once you find those coordinates, you can replace my coordinates with yours and it should work.? Here's my script:

; start on raid tab
; window has JUST BARELY visable white above game
loop
{
click 572, 688 ; click slot 3
sleep 5000
click 638, 788 ; hit for 1
sleep 5000
click 1000, 800 ; close
sleep 5000
click 565, 543 ; click slot 2
sleep 5000
click 638, 788 ; hit for 1
sleep 5000
click 1000, 800 ; close
sleep 5000
click 813, 144 ; heal
sleep 5000
click 598, 521 ; okay heal
sleep 5000
click 702, 607 ; okay level
sleep 5000
click 841, 404 ; X just incase error
sleep 100000
}
Esc::ExitApp
return

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Best of luck, expect this to take a few days even with botting.? This whole game's 'waiting' system is dumb, but this game getting a badge is even worse.?