Unlock: Complete Trevor Phillips Industries, Use Trevor
Bonus Requirements:
– Achieve 45 kills
– Achieve 6 headshots
– Obliterate two vehicles
Trevor's rage mode is activated at the onset of the mission plus you have a grenade launcher with infinite ammunition. Blast the vehicles using the grenade launcher. After getting around 40 casualties, let the remaining enemies exit out the vehicles and start hitting those headshots.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art.