dude, as far as this game goes, this is waaayyyyyy too easy an achievement. key is on second platform between 2 pillars b4 you hit the first wall. or something like that, but it's b4 you hit the first wall that you need to go over. how about you have an achievement for getting every gun in the game? now THAT is a challenge. if you're a pretty good player, it's just time consuming because you need to get a certain high score in the survival rounds for some guns, and you need to redo every chapter with a minimum number of kills to get the rest. chap 1, 50 kills, chap 2 100, then chap 3, 25 kills and then kill the first boss. and it keeps going up. have fun pplz!!!
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