I found this easy to do with the Trickster class, but I’m assuming this will work fairly easily with other classes too.
Once you get to First City you will do a mission called “Salvation,” which is a main quest. You come across these snaggle tooth creatures called “Perforo” that spawn in droves. I found it easier to do this achievement on these creatures rather than the soldier enemies because they have less health and they run after you.
Just run around to gather them up, then if you’re playing as a Trickster activate your Slow Trap special ability with
then hit your Temporal Blade ability (depending on where you have it bound it will be
or
) which will cause the creatures to explode. For good measure, I also tacked on the Cyclone Spin to make sure they all died using my
. First try I unlocked it.
I just took a video, so I’ll post it as soon as it’s ready.
Good luck!