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Liberation! Complete "The Battle of Plank Harbor"

No Man Left Behind Rescue Woods.

... Oops. Complete "I'm Probably Dead"

Just Gettin' Started Complete 1 challenge in any level.

Successful Search Find all skulls and terminals in Halo.
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Personal Space Complete Heavy Burden.

Crank Up the Gain Complete "Plankerton Storm Shield Defense 6"

Many Planks Complete all the Main Quests in Plankerton

Future Days Complete "Canny Valley Storm Shield Defense 1"

Buried Treasure Find all skulls and terminals in Silent Cartographer.
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I Don't Think They Exist In TranZit, kill one of the denizens of the forest while it is latched onto you.

Evil Things with Crazy Teeth Complete "Toxic Treasures - Stage 10"

Fashion Plate Even a top rate fighter needs to coordinate properly! You gotta get all of the Colors first!

Stowed in Snow Find all skulls and terminals in Assault on the Control Room.
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Dan the Man Mastery of the Saikyo arts requires mastery of the Personal Action! Collect 'em all, punk!

Birth of a Spartan Complete the Campaign on Normal Difficulty.
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Making a Necklace Collect 22 Skulls.
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Proto Gravemind Find all skulls and terminals in 343 Guilty Spark.
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Party Animal Win 10 multiplayer games while playing in Party Games playlists.

Plundered Find all skulls and terminals in Truth and Reconciliation.
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Gathering Storm Investigate the jungle facility.

Timeless Tomes Find all skulls and terminals in The Library.
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Loot Legend Loot 300 Treasure Chests in successful missions

REMIX! Complete a Remixed Mission.

Outpost Discoveries Find all skulls and terminals in Two Betrayals.
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Gun Nut Complete a level with customized loadout.

All Clear To get strong takes lots of fighting! Clear Arcade Mode on Medium or higher with all characters!

Trained Up Win 10 multiplayer games while playing in Combat Training playlists.

No Rush Find all skulls and terminals in The Maw.
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Souvenirs Find all skulls and terminals in Boarding Action.
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Brute Loops Find all skulls and terminals in The Most Dangerous Game.
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Beat the Drop Complete a Remixed Mission without dying.

Sunspotter Amigo, perform 365 Super or Ultra Combo finishes against your opponents! The dawn is coming!

Shifting Sands Gather intel on Raul Menendez from Mullah Rahmaan.

Priorities Find all skulls and terminals in Keyes.
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Parting Gifts Find all skulls and terminals in Heavy Burden.
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Lore Have Mercy Activate all 13 Terminals.
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Quad Squad Complete "Quad Squad"

Headhunter Collect all 39 Skulls.
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Collector’s Addition Find all skulls and terminals in the game.
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Clean Lap On The Maw complete the warthog run without being forcibly ejected from your vehicle.

This is My Ship Now Eliminate Captain Keyes and trap his six avenging Marines in the Autumn’s observation pen.

New Whip Hijack 10 Vehicles.
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Heroes Never Die Complete the Campaign on Heroic Difficulty.
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Undead Man's Party Bus In TranZit, complete all additions to the bus in 1 game.

Fuel Efficient In TranZit, use an alternative mode of transportation.

Food Critic Listen to the Thirsty Grunt talk about his eating habits.

Rival Schooled See your future by clearing every Rival Battle on Medium or higher with every character.

Driven by Rage Take down Menendez and his operation.

Happy Hour In TranZit, buy 2 different perks before turning on the power.