Halo 4
86 Achievements
2,000
26-34h
What Power Outage?
Completed Chapter 4, Episode 5 of Spartan Ops without losing a generator on Heroic or harder.
20
How to unlock the What Power Outage? achievement in Halo 4 - Definitive Guide
ALSO something to note. Not 100% sure about this but pretty sure. On solo, you can only use mantises while on co-op you can only use warthogs. Just thought I would mention it to people who are wondering.
In the beginning of the mission, there are a couple Warthogs (Chain & Gauss). Take them and park them in front of the generators. There are also a couple more near the generators, so you can create a small blockade. Get into the gunner seats and shoot anything that moves.
There are multiple waves of varying difficulty (including Hunters and Elite Officers), coming from both drop pods and Phantoms; but with a little teamwork, this achievement should not be a problem.
Infinity Multiplayer :: Spartan Ops related. Online Required. Must be obtained on Heroic+.
Don't lose a generator during Episode 5: Memento Mori • Chapter 4: The Cauldron Base either Solo or Cooperatively.
There are 2 generators you must protect. If you are playing Co-op with 4 players you will spawn with 2 Warthogs at the start of the level. If you are playing Solo or Co-op with 2 players, you will spawn with Mantis at the start of the level.
Get in the vehicle of your choice and use it to kill the enemies up until you reach the generators. Position your vehicles between or around each generator to protect the one that will be attacked (the side the covenant is dropped off on, that generator is usually attacked). There are also stationary turrets located above each generator if you need extra firepower.
Using the Mantis (1-2) to protect the generators is reported to be the easiest method.
A warthog tactic that works (3+) - Position the Gauss Warthog between the generators.
Have the second Warthog be Spartan driven with 2 marines (one with rockets). Use this Warthog to ambush the Covenant after each time they are dropped off. Your marine with rockets will usually take care of the Phantom's plasma gun, and large groups of Grunts.
Drive back and forth under the bridge and attack the Covenant from behind as they push toward each generator.
A warthog blocking tactic that works (3+) - Use the warthogs to try and "block" the 4 main entrances to the base, which will give you more time to kill enemies, and block them from getting within range of damaging your generators. From here, you can use the Warthog or Gauss Warthog to kill enemies (ranging from grunts to hunters) as they flood from each direction, or you can stay on foot, running around and killing them. After about 3-5 minutes, the enemies will stop spawning, and as long as both generators are still active, everyone in the game will get the achievement.
Repeat if unsuccessful.