Quantum Theory

To unlock this achievement, you must kill 500 enemies. These do not have to be specific enemy types, everyone counts, nor does it have to be done on a specific difficulty or with a certain weapon. This should be attained by the end of the campaign. If it isn’t, load up the last check point, there are a lot of enemies here that are easy to kill.

Please note, kills still count even if you die and the checkpoint gets reloaded.

I hope this solution helped! Leave a comment letting me know if there is any room for improvement! Thanks.