List of Halo 5: Guardians commendations/Multiplayer

Spartan Slayer
Take out enemy Spartans

Multikill
Quickly kill multiple enemy Spartans

Smash
Kill an enemy Spartan with melee

Juggernaut
Kill an enemy Spartan with shoulder bash

Combat Opportunist
Earn any combat skill medal

Whites of Their Eyes
Kill a full health Enemy Spartan with a precision weapon without missing any shots

And Stay Off
Kill an enemy Spartan that is clambering

Headshot
Kill an enemy Spartan with a headshot

Spartan Spree
Kill multiple enemy Spartans without dying

Assassin
Assassinate enemy Spartans

Geronimo
Kill an enemy Spartan

Protector
Protect a teammate

Close Quarters
Earn any CQC medal