For anyone who is stuck on this achievement, do the following method as it worked for me.
1) Make sure you have your achievement tracker on. Start this glitch fest of a game.
2) Do a force quit. For those who don't know how to do this, you basically press the
button than high light the game than press
button and select quit.
3) Once your game loads up start a new game and select a different character. (Prepare to see this alot)
4) Play and complete the tutorial without shooting. Get to the 1st boss without shooting. Once your at the boss kill him. If your about to die use the cheat code (
) to restore your health and get enough coins to max out your weapon. You should be good with 2k.
5) Once you load up Chapter 2 just stand there and shoot. Once your bar stops moving. Force quit your game go to your achievement and make sure what your achievement tracker tracked is no longer highlighted. It's now just rinse and repeat.
I hope this helps several gamers out with this glitch fest of a game.