Rango
46 Achievements
1,000
6-8h
Gun Happy
Complete a tale using only your gun
20
How to unlock the Gun Happy achievement in Rango - Definitive Guide
Melee on inanimate objects such as crates will also void this achievement - however any accidental melee on thin air will not void this achievement. The melee must make contact with something to void it.
To be safe I would stay well away from the melee button just in case
Go through a level only killing bad guys and smashing objects with your gun. You CAN actually press X by mistake but make sure you don't hit anything.
Side NOTE: I actually pressed X while i was not in combat and also ground pounded with A,X and the achievement popped at the end of Tale 3.
You must complete one stage without using a single melee attack. The easiest stage to do this in is probably stage 2 (Water Train), but you can do it on pretty much any other stage that you have your gun for the entire thing. Once you complete any of the stages using only your gun, the trophy will pop!
Just complete a level without using any melee attacks on enemies, pretty simple really. You may get away with breaking boxes and collectibles with melee attacks though, as long as you don't hit an enemy with a melee attack you should be fine. However just to be on the safe side I recommend you use your gun to break all crates, barrels, and fish bowls. Level 2 (Water Train) would be a good level to obtain this achievement on.