Lost, and found.

Explore the underbelly of Zeta Halo and retrieve a weapon to turn the tide of this conflict.

Defeat the Banished warlord Tremonius.

Fight your way through Outpost Tremonius and step out onto the surface of Zeta Halo.

Follow the UNSC signal to a Banished stronghold called the Tower. Find the source. Get out alive.

Shut down the Banished mining laser and gain access to the Conservatory.

Defeat the Hunter pair stationed at the base of the Spire.

Shut down the first Spire and stop Zeta's Reformation before it's too late.

Destroy a Banished anti-aircraft gun.

Take down the Spartan Killers Hyperius and Tovarus.

Reach the Beacons, assemble the Sequence, and gain access to the Command Spire.

Enter the Nexus and learn the secrets of the Spires. Trust is a fragile thing, isn't it?

Infiltrate the Command Spire and put an end to the Reformation.

A friend is in danger and time is running out. It's time to face your past and save your future.

Storm the House of Reckoning.

At the end he was just a soldier. Hoping he'd done the right thing.

Defeat the Harbinger. Confront the truth.

Complete the main campaign.

Complete the main campaign on Normal difficulty.

Complete all main campaign missions on Heroic difficulty.

Complete all main missions on Legendary with all Skulls active.

Unlock the Thruster ability.

Unlock the Drop Wall ability.

Unlock the Threat Sensor ability.