Mode: Battle Enemies
Enemies: Clones, Battle droids (security)
Go to a middle area, where there are at least two paths leading to it, and blast them as they all come to you. You don't really need to move very much.
Mode: Collect Studs
Mode: Stud Hunt
Hunt: 146,000 studs
This one is tricky due to a glitch in the game. There is a panel that you should be able to activate with the Force, which will enable you to reach another part of the map. However, you cannot use the Force on this platform as of the time I am writing this. I have found on a couple of blogs that you can technically reach this area with Boba or Jango Fett, using their jetpacks, but I have been unable to do so. Instead, I wait to pick up studs until I have found a power-up, as these double your stud collection. Without hovering over to the glitchy area, this is the only way you can complete this mission. Focus on power-ups, and it should be very doable.
There is also another area you need to get to that is similar to the glitchy area, but you can actually reach it. To get here, shoot two targets, and a platform will extend. There are several purple studs in this area, and you can grapple up to the top ledge to collect a power-up.