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Double Trouble Complete Two Betrayals.

Outpost Discoveries Find all skulls and terminals in Two Betrayals.
100/100

Disarmed Dismember 100 Flood parts.
100/100

Protocol Dictates Action Complete The Library.

Timeless Tomes Find all skulls and terminals in The Library.
100/100

Making a Necklace Collect 22 Skulls.
100/100

This Stuff is Your History Complete 343 Guilty Spark.

Proto Gravemind Find all skulls and terminals in 343 Guilty Spark.
100/100

Control Alt Delete Complete Assault on the Control Room.

Stowed in Snow Find all skulls and terminals in Assault on the Control Room.
100/100

That’s My Ride On Assault on the Control Room get to the Banshee before the Elite.

Claims Adjuster Break off 50 Vehicle parts.
100/100

Make Them Count Kill 100 enemies with headshots.
100/100

Bee Thirty Complete Silent Cartographer.

Buried Treasure Find all skulls and terminals in Silent Cartographer.
100/100

Infiltration Anticipation Complete Truth and Reconciliation.

Plundered Find all skulls and terminals in Truth and Reconciliation.
100/100

I Don't Think They Exist In TranZit, kill one of the denizens of the forest while it is latched onto you.

Installation 04 Complete Halo.

Successful Search Find all skulls and terminals in Halo.
100/100

The Autumn Leaves Complete Pillar of Autumn.

Clean Sweep Find all skulls and terminals in Pillar of Autumn.
100/100

Cranial Collect a Skull.

The Heir of Memories Complete The Heir of Memories

Every Story Has an Ending Complete Every Story Has an Ending

Old Flames Burn Brighter Complete Old Flames Burn Brighter

Divine Intervention Complete Divine Intervention.

A Poet's Legacy Complete A Poet's Legacy.

The Show Must Go On Complete The Show Must Go On.

Chimp on the barbie In Ascension, kill a space monkey with a fire trap.

They are going THROUGH! In Ascension, kill at least 5 zombies with 1 Gersh Device.

Space Race In Ascension, Pack-a-Punch a weapon before round 8.

The eagle has landers In Ascension, escape on all 3 lunar landers.

Sally Likes Blood Demonstrate killer economic sensibilities by taking down 3 enemies with a single bullet.

Just Gettin' Started Complete 1 challenge in any level.

No Man Left Behind Rescue Woods.

Big Leagues Start the Campaign.

Party Animal Win 10 multiplayer games while playing in Party Games playlists.

Easy Rhino In Dead Ops Arcade, use a Speed Boost to blast through 20 or more enemies at one time.

Insert Coin Access the terminal and battle the forces of the Cosmic Silverback in Dead Ops Arcade.

Eaten by a Grue Play Zork on the terminal.

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

Ready For Deployment Reach rank 10 in Combat Training.

Just ask me nicely Break free from the torture chair.

Welcome to the Club Reach Sergeant (Level 10) in multiplayer Public Match.

Epic Cycle Earn every trophy.

Odyssey's End Complete Episode 9 + Epilogue.

Legacy Restored Upgrade your Spear to Tier 6.

The Cult Unmasked Defeat all the Cultists of Kosmos.

Hermes's Homie Unveil all sub-regions of Greece.