List of Halo 4 commendations/Enemies

Enemies commendations are awarded in Spartan Ops only

Backstab
Assassinate Covenant and Forerunner enemies.

Grunt Slayer
Kill Grunt Infantry

Grunt Imperial Slayer
Kill Grunt Imperials and Space Grunts

Grunt Ultra Slayer
Kill Grunt Ultras

Jackal Slayer
Kill Jackal Infantry

Jackal Major Slayer
Kill Jackal Majors

Jackal Ranger Slayer
Kill Jackal Rangers

Elite Slayer
Kill Elite Infantry

Elite Zealot Slayer
Kill Elite Zealots and Rangers

Elite Officer Slayer
Kill Elite Officers

Elite General Slayer
Kill Elite Generals

Hunter Slayer
Kill Hunters

Covenant Destroyer
Complete all of the following commendations: Elite General Slayer, Elite Officer Slayer, Elite Zealot Slayer, Grunt Ultra Slayer, Grunt Imperial Slayer, Hunter Slayer, Jackal Ranger Slayer, Jackal Major Slayer, completing this commendation will unlock the Orbital "Aeon" (AEON) armor set, and the "Covenant" emblem

Crawler Slayer
Kill Crawler Infantry

Crawler Sniper Slayer
Kill Crawler Snipers

Crawler Prime Slayer
Kill Crawler Primes

Knight Slayer
Kill Knights

Knight Battlewagon Slayer
Kill Knight Battlewagons and Rangers

Knight Commander Slayer
Kill Knight Commanders

Watcher Slayer
Kill Watchers

Forerunner Destroyer
Complete all of the following commendations: Crawler Slayer, Crawler Prime Slayer, Crawler Sniper Slayer, Knight Commander Slayer, Knight Slayer, Knight Battlewagon Slayer, Watcher Slayer, completing this commendation will unlock the Vanguard armor set, and the "Promethean" emblem