Rescued Adam Fenix from captivity.
Turned off the Maelstrom device.
MVP in a ranked match
There is only one way in
Save the medical volunteers
Save the damsel, but is she in distress?
Become the Bat
Complete story mode on Easy difficulty
Complete story mode on Normal difficulty
Continue playing to unlock this secret achievement.
Ride a beast and unleash its power
Solve 55% of Riddler challenges
Passed under the Maelstrom and found Azura.
Launched the sub.
Found enough fuel to get to Endeavor naval base.
Found and activated the fuel pump.
Drove from Anvil Gate to Mercy.
Complete every level of the game on Heroic difficulty.
Complete the level "The Maw" on any difficulty.
Complete every level of the game on Normal difficulty.
Read half the terminals hidden throughout the campaign.
Complete the level "Keyes" on any difficulty.
Complete the level "Two Betrayals" on any difficulty.
Complete the level "The Library" on any difficulty.
Complete the level "343 Guilty Spark" on any difficulty.
Complete the level "Assault on the Control Room" on any difficulty.
Pilot a Banshee on the level "Assault on the Control Room."
Complete the level "The Silent Cartographer" on any difficulty.
Storm the beach of "The Silent Cartographer" with no marine casualties on Heroic or Legendary.
Complete the level "Truth and Reconciliation" on any difficulty.
Complete the level "Halo" on any difficulty.
Complete the level "Pillar of Autumn" on any difficulty.
Complete any level on Normal difficulty cooperatively.
Complete any level on Heroic difficulty cooperatively.
Read a terminal.
Reach "To Link the Fire" ending.
Defeat the Soul Lord Bed of Chaos.
Defeat Crossbreed Priscilla, the Lifehunter.
Defeat Dark Sun Gwyndolin, the Darkmoon God.
Defeated the Lambent Berserker.
Defended Anvil Gate from the Locust siege.
Arrived safely, kinda, at Anvil Gate.
Grabbed a Locust Gas Barge to travel to Anvil Gate.
Reached level 5.
Defeat the Four Kings, inheritors of souls.
Defeat Seath the Scaleless, inheritors of souls.
Discovered the location of Adam Fenix.