Halo: Campaign Evolved Walkthrough — Finishing All 10 Main Missions

Halo: Campaign Evolved rebuilds the original ringworld adventure with sharper combat, new weapons, and modern mobility, but the spine of the story stays the same. You play Master Chief, backed by Cortana, working through ten main missions that carry you from a doomed warship to the destruction of Installation 04. Below is the full route, the order the missions unlock in, and the exact things to do at each stage so you can finish the fight without stalling.

Quick answer: Complete the ten main missions in order — The Pillar of Autumn, Halo, Truth and Reconciliation, Silent Cartographer, Assault on the Control Room, 343 Guilty Spark, The Library, Two Betrayals, Keyes, and The Maw — then survive the timed Warthog escape to the Longsword to roll credits.

Main campaign mission order

The main story runs across ten missions. Three additional prologue missions — Boarding Action, The Most Dangerous Game, and Heavy Burden — sit separately as bonus content and are not required to complete the main quest.

#	Mission	Core objective
1	The Pillar of Autumn	Escape the crippled warship
2	Halo	Rally scattered Marines on the ring
3	Truth and Reconciliation	Board the cruiser and free Captain Keyes
4	Silent Cartographer	Find the map room and Halo’s control center
5	Assault on the Control Room	Reach the core and insert Cortana
6	343 Guilty Spark	Investigate the swamp and survive the Flood
7	The Library	Follow 343 Guilty Spark to obtain the Index
8	Two Betrayals	Disable the three pulse generators
9	Keyes	Return to the cruiser
10	The Maw	Destroy the Pillar of Autumn and the ring

Missions 1–3: Escape, regroup, and rescue Keyes

On The Pillar of Autumn, wake from cryo-sleep and run the basic suit diagnostic checks. Push to the bridge and retrieve Cortana from Captain Keyes, then fight through the maintenance corridors past Covenant boarding parties and reach the last remaining lifeboat to escape.

The Halo mission drops you onto the surface of Installation 04. Locate the marine lifeboats scattered across the valley, hold off Covenant dropships alongside Sergeant Johnson, and clear the underground Covenant passages using the Warthog.

On Truth and Reconciliation, infiltrate the Covenant battlecruiser at night by riding its gravity lift. Locate the holding cells, free Captain Keyes, and extract him using a captured Spirit dropship.

Missions 4–5: Find the control center and insert Cortana

Silent Cartographer opens with a beach assault on the island installation. Override the facility’s security lockdown at the substation, then descend into the lower levels to reach the map room and pinpoint the location of Halo’s control center.

In Assault on the Control Room, push through the snowy canyons with armored support. Use Scorpion tanks and Ghosts to break through enemy lines, then descend into the interior structures.

Reach the central control terminal at the core and insert Cortana into the array. This is where the story pivots and the Flood threat is uncovered.

Missions 6–7: The Flood outbreak and the Index

In 343 Guilty Spark, investigate the swamp facility where Captain Keyes’ squad went missing. Survive the initial Flood outbreak, which is the first time these enemies appear.

Follow 343 Guilty Spark through the multi-tiered Library. Fight through wave after wave of Flood combat forms across the level’s rising floors until you obtain the Index.

Note: Carry a shotgun or SMG before entering the tight corridors here. A sniper rifle or plasma pistol alone leaves you badly exposed to Flood crowds in enclosed spaces.

Missions 8–10: Pulse generators, Keyes, and the final escape

In Two Betrayals, overload all three phase pulse generators spread across the canyon to stall the ring’s firing sequence. Use Banshees to move quickly between the generator sites.

The Keyes mission takes you back to the Covenant cruiser. Work through it to set up the final approach on the crashed Pillar of Autumn.

On The Maw, board the crashed Pillar of Autumn and blow the exhaust couplings in engineering. Rupture the four primary fusion reactor cores with explosives to start the detonation.

Execute a high-speed Warthog escape down the ship’s spine to the docked Longsword fighter before the final blast. Reaching the Longsword ends the mission and completes the main campaign.

You know the campaign is finished when the escape sequence closes on the Longsword and the ending cinematic plays. The ring is destroyed, and credits follow.

Combat habits that keep you alive

A few consistent habits carry you through the harder encounters, especially against shielded Covenant and the Flood.

Let Marines drive the guns. Marine AI on Warthog and Scorpion turrets is accurate and deadly, so put them on the heavy weapons and focus on driving.
Match your weapon to the shield. Strip Elite and Jackal energy shields with plasma rifles or plasma pistols, then switch to the magnum or assault rifle for kinetic headshots.
Use sprint to reposition. The modern sprint lets you retreat behind cover the moment your shields break, or rush a high-priority target.
Finish the Flood completely. Combat forms reanimate if their torso survives, so use heavy kinetic weapons or explosives to fully dismember them.
Grab Overshields and camouflage. Covenant Overshields and active camouflage pickups appear in interior arenas and give you a short tactical edge.

Here are some things that you need to do

Mistakes that get you killed

Entering Flood corridors without a shotgun. In 343 Guilty Spark and The Library, a shotgun or SMG is essential for crowd control. Do not rely on a sniper or plasma pistol.
Standing near infection pods. Individual Infection forms look harmless, but in clusters they drain your shields fast and pop unshielded corpses into new combat forms.
Wasting explosives on single targets. Save grenades and rockets for choke points, Hunters, and armored Elites rather than lone Grunts.
Leaning on melee. A strike from behind is an instant assassination, but a frontal melee against an Elite or Hunter usually gets you killed.

Here are some things that you need to avoid

Stick to the mission order above, keep the right weapon on hand for each enemy type, and treat the final Warthog run as the last real test. Clear those ten missions and Installation 04 comes down, closing out Master Chief’s first campaign in full.