Discover the true nature of the Aurora device

Kill 5 enemies while they are conducting a Call for Reinforcements

Find 200 pickups in Operations mode

Hear all of the Chaplain's dialogues

Got all artifacts in Cooling Springs.

Got all puzzle pieces in Memory Meadow.

Cleared Memory Meadow.

Obtain 150,000 studs from Instruction Builds bonuses. (Single Player Only)

Listen to all the Writer's messages

As a Tactical, kill 25 enemies with every available Primary Weapon

Kill 1,000 Tyranids in Operations mode

Complete three Tombs of the Fallen