- this could be done on Mission 4 - Chapter 1
- i recommend doing this on easy
- start the mission, run to the area where you first have to fight 2 Titans.
- kill them and you will fill up your core
- after the 2 Titans a door will open and 3 more Titans will show up
- here you've to fire all 3 down to 1 point of health
- then activate your core ability (i choosed the expedition)
- kill all 3 Titans with your core ability