Halo: Campaign Evolved is more than just an Unreal Engine 5 remake of the classic shooter. Beyond its collectibles and quality-of-life updates, the game features unexpected secrets early on, including an early achievement that turns the Pillar of Autumn against you.

Earning the This Is My Ship Now trophy or achievement requires eliminating Captain Keyes immediately after he hands you his unloaded pistol, and then corralling the six marines he calls in. Here is the step-by-step process to pull it off.

Steps At a Glance

  1. Lower the game difficulty to Easy to manage the incoming marines.
  2. Eliminate Captain Keyes using melee strikes or headshots.
  3. Locate the ladder leading down to the observation pen beneath the cockpit.
  4. Lure the six avenging marines toward the pen individually.
  5. Use melee attacks and movement physics to push all six marines into the pit.

Step 1: Prep and Eliminate Captain Keyes

The official description for the achievement is 'Eliminate Captain Keyes and trap his six avenging Marines in the Autumn’s observation pen.' To start, approach Captain Keyes and take him down with a few melee strikes or a few bullets to the head. Because the entire ship turns hostile the second he drops, playing on Easy difficulty is recommended so you can survive the firefight and position the marines.

Step 2: Find the Observation Pen

The observation pen is a small area located directly beneath the cockpit and twin pilots. Find the ladder leading down into this pit. Following Keyes' death, Cortana summons a group of marines to take you down.

Step 3: Lure and Push the Marines Into the Pit

The marines will not follow you directly into the hole and will open fire on sight. Peek around the corner and slowly split them up, as a couple may remain outside the bridge while others charge into the map room. None of the invading marines can be killed.

Individually lure them toward the observation pen. Use a combination of melee attacks and your own movement to push their models toward the desired location, as they tend to slide. Hitting them with melee strikes from a ledge or standing on top of the ledge to strike them from above makes it easier to use the physics system and send them flying into the pit.

Once all six marines are trapped in the hole, the trophy or achievement pops. Keep in mind that you will need to reload your game to progress afterward.