Ok, so go to mission select, mission 7 (TRIAL BY FIRE), select EASY and right after you've landed, change your titan to
ION cause he's the
only titan that has the laser core. And also, if you try to build your core with a different titan and thinking that after it's 100% charged up, then you're gonna switch to ION, then you're making a mistake cause the core status will reset. So switch to ION, do some kills and when you're prompted on screen that your core ability is charged up, press
and aim at any titan on the field.
Also, here is where i also earned
The Hat Trick achievement in Titanfall 2 worth 30 pointsDestroy 3 enemy Titans with 1 Core ability in the Campaign for killing 3 titans with 1 core ability (i didn't wait for 3 titans to group up, but believe me, it's very duable)
Also, i'll post a video guide as well
If you leave a negative vote, please state the reason for your vote and i'll improve my solution
HAPPY ACHIEVEMENT HUNTING