How annoying. After hours of trying, when I finally get the master achievement it's done without dieing. OMG is the last leader easy with the spread gun.
Levels 1-4 I almost never die on, but I suck at level 5. I got to level 5 multiple times with all my lives and would fail. I find changing to the rapid fire gun and back to the level one spread gun makes the 3rd leader much easier then defeating him with a level 2 spread gun.