Complete all 14 main missions in under eight hours.
Get the Scorpion all the way to the "House" without it blowing up.
Discover all hidden Skulls.
Kill a Grunt that's been thrown by a Brute.
Stick 50 enemies with grenades.
Bring some rescued UNSC Marines along for the ride into a main mission.
Deploy the Drop Wall 50 times.
Use the Thruster 50 times.
Check out the best possible view.
Unlock all Spartan Audio Logs.
Access all 34 Mjolnir Armor Lockers.
Unlock all UNSC Audio Logs.
Complete the main campaign.
Complete the main campaign on Normal difficulty.
Complete all main campaign missions on Heroic difficulty.
Complete all main campaign missions on Legendary difficulty.
Complete all Valor-awarding activities.
Unlock all Banished Audio Logs.
Scan all seven Forerunner Artifacts.
Destroy 40 Banished Propaganda Towers.
Fully upgrade the Thruster ability.
Acquire all Spartan Cores.
Eliminate all 15 Banished High-Value Targets.
Answer all UNSC distress calls.
Capture all available Forward Operating Bases.
Fully upgrade the Drop Wall ability.
Complete all seven Banished outposts.
Fully upgrade the Threat Sensor ability.
Take down all three Banished AA guns.
Use the Threat Sensor 50 times.
Unlock the Thruster ability.
Unlock the Drop Wall ability.
Use the Grappleshot to board an enemy Ghost.
Splatter an enemy with a Ghost.
Fully upgrade the Grappleshot.
Throw 50 fusion coils.
Scan a Forerunner Artifact.
Fully upgrade your Energy Shields.
Unlock the Threat Sensor ability.
Take out a Banished Propaganda Tower.
Eliminate a Banished High-Value Target.
Complete a Banished outpost.
Answer a UNSC distress call.
Capture your first Forward Operating Base.
Access your first Mjolnir Armor Locker.
Locate and secure a Spartan Core.
Access your first UNSC Audio Log.
Discover your first hidden Skull.
Successfully use the Grappleshot 50 times.
Access your first Banished Audio Log.
Access your first Spartan Audio Log.
Secure 5 zones in a matchmade Strongholds game.
Complete the Tutorial.
Access your Personal AI.
Earn a Mythic Medal in a matchmade game.
Finished Ranked Placement Matches.
Complete one level in a Battle Pass.
Play a custom game.
"Back Smack" an enemy who is zoomed in with a scoped weapon in a matchmade game.
Capture the flag twice in a matchmade Capture the Flag game.
Earn 2,000 score in a matchmade game.
Mark an enemy located at "Top Mid" in a matchmade game.
Complete a Weekly Challenge.
Mark 3+ enemies at once in a matchmade game.
Complete a Daily Challenge.
Play a Ranked Match.
Change your Spartan Tag.
Get and equip a new AI.
Change your Spartan's look in the Customize menu.
Test drive a new vehicle customization.
Try out a new weapon customization item.
Wear a new armor customization item.
Earn 3 stars in 5 Tier 3 Weapon Drills.
Earn 3 stars in a Weapon Drill.
Complete a Weapon Drill.
Complete all main missions on Legendary with all Skulls active.
Complete a Battle Pass.
Complete a Limited Time Challenge.
View a clip in theater.
Launch into Training Mode for the first time.
Change any training mode option.
Earn "Mount Up" in a Razorback in a matchmade game.
Earn "Chain Reaction" with a Shock Rifle in a matchmade game.
Kill an enemy with melee using a bladed weapon in a matchmade game.
Kill an enemy with the Ravager's charged shot in a matchmade game.
Destroy an enemy vehicle with the Skewer in a matchmade game.
"Grapplejack" an enemy flying vehicle in a matchmade game.
Pick up a weapon using the Grappleshot in a matchmade game.
Place an item in the Razorback's storage in a matchmade game.
Repel an enemy grenade with the Repulsor in a matchmade game.
Drop a Power Weapon for an ally in a matchmade game.
Drive 4 unique vehicles in a matchmade game.
Spectate an ally that is driving a Warthog or Razorback in a matchmade game.
Gain access to a loot cave in a matchmade game.
Kill three enemies with the ball in a matchmade Oddball game.
Revive 3 allies in an Attrition/Elimination round in a matchmade or custom game.
Assist in capturing all zones that lead to a score in a matchmade Total Control game.
Deposit 5 Power Seeds in a matchmade Stockpile game.
Grab a power weapon from the Tutorial armory.
Earn "Splatter" with a Brute Chopper in a matchmade game.
Earn "Perfect" with a VK78 Commando in a matchmade game.
Get at least one kill with every available weapon and grenade on the Banished ship.
Defeat Tremonius with the Skewer.
Destroy both Phantoms before they leave Outpost Tremonius.
Kill the Tower commander with a Plasma grenade.
Kill an enemy with the Banished mining laser.
Complete the Conservatory in less than 15 minutes.
Eliminate all enemies at the South Beacon with a Scorpion Tank.
In the Nexus, kill the Hunter pair with melee final blows.
In co-op, kill 100 enemies while all players are riding air vehicles.
In co-op, splatter 50 enemies while riding in a vehicle with another player.
In co-op, kill 50 enemies while riding a Mongoose with another player.
Kill 5 enemies with a Sniper Rifle from a vehicle. All players aboard vehicle share progress.
Kill 5 enemies with a Gravity Hammer from a vehicle. All players aboard vehicle share progress.
In co-op, kill a Hunter and its bond brother within three seconds of each other.
In co-op, destroy all cooling towers at the Dig Site within 60 seconds of each other.
In co-op, destroy four Fuel Silos within five seconds at either Ransom Keep or the Forge of Teash.
In co-op, lower all three gates within 15 seconds of each other at Riven Gate.
Kill 40 enemies with the Stalker Rifle at the Command Spire.
Kill one Chieftain and use his turret to kill another in the Repository.
Defeat War Chief Escharum without ever fully losing your shields.
Breach the Auditorium in under three minutes.
In co-op, capture all Forward Operating Bases on any difficulty.
In co-op, complete all seven Banished outposts on any difficulty.
In co-op, answer all UNSC distress calls on any difficulty.
In co-op, eliminate all Banished High-Value Targets on any difficulty.
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