for "Rush hour" achievement try to get Browning at second level and killer mode!
just don't kill mission target! after that do "industrious" achieve... in gems 2 mode you can get "crank", "rambo" and "world dominator".... most important thing - change your minigan on browning before reload and back the same - it's like hell for zombies =))
this is realy fun and addictive game! I like it! =) 5/5
medal for rapid = beating the game less than 60 min & it's possible =)
(my record 49:47)
medal of awesome = 4 achievements at one level
suicide = nuke + lightning