Catch This Achievement in Halo: The Master Chief Collection

These Multiplayer medal are represented by a white grenade/plasma grenade icon and are available in Halo: Combat Evolved, Halo 2 Classic, Halo 2: Anniversary, and Halo 4. The former is awarded to players upon killing an opponent by using a Fragmentation Grenade or Pulse Grenade while the latter is awarded to players for killing an opponent by using a Plasma Grenades. Like the above achievements, there is no definitive way to boost Grenade Kill and Plasma Kill medals.

The best playlists to work on this achievement are Halo Champion Series or Rumble Pit. The former only offers three maps (Lockdown, Shrine, and Warlord), though these maps (especially Warlord) are great for Grenade/Plasma Kill medals on objective matches such as King of the Hill. The latter of these playlists is also a great option because it’s essentially a Free-for-All match. This means that everyone is competing for their own interests, meaning you can probably nab a few kills via grenades while other playes are fighting each other and duking it out. Once you achieve 500 Grenade Kill or Plasma Kill medals, this achievement will unlock.