Explosive EfficiencyG 15

Start mission 8 with a loadout containing at least one grenade.

Run along the linear path at the start of the mission until you come across a small square with 4 german troops. 1 should be near you, and the other 3 should be close together, further away from you, near an explosive gas container.

Throw a grenade at the 3 troops and you should get all three. If they weren’t clustered together, you weren’t quick enough and will need to restart. I did this first try, it’s not difficult as long as you get there before the 3 enemies finish their conversation and spread out.