RESIDENT EVIL 2
44 Achievements
1,070
27-33.5h
Zombie Roundup
Kill 3 enemies at once with a sub-weapon.
20
13.25%
How to unlock the Zombie Roundup achievement in RESIDENT EVIL 2 - Definitive Guide
extra for people who haven't done this dlc yet, kill the guy with the backpack upstairs to get the key, grab the grenade from the machine behind him, run down the stairs to the door to exit, then sprint and kill the second backpack guy for the next key ignoring the dogs, sprint to the door to exit the area, then your right at the part with the bus load of zombies.
Happy hunting!
Here is my video guide that also shows grenade location and the perfect spot to get this
This will need to be done with a grenade, since only knives and grenades can be sub-weapons and a knife will of course not suffice. You will need a 'Hand Grenade' for this as the 'Flash Grenade' too will not suffice. Once you have one you now need an area with at least 3 zombies. The best place to obtain this achievement would be in the Jail, which is in the Basement of the Police Station. After progressing enough through the story, all of the cells will be opened and this will unleash around half a dozen or more zombies. If you can get at least 3 of them close enough together, throw a grenade into them to kill them and unlock the achievement.