Nthusiastic

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

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

All Shield, No Yield Complete any level on Heroic difficulty or higher without taking health damage.

Cranial Collect a Skull.

Personal Space Complete Heavy Burden.

Tiger Company Complete The Most Dangerous Game.

Before the Fall Complete Boarding Action.

Heroes Never Die Complete the Campaign on Heroic Difficulty.
100/100

Living Legend Complete the Campaign on Legendary Difficulty.
100/100

Birth of a Spartan Complete the Campaign on Normal Difficulty.
100/100

Dust & Echoes Evolved Complete The Maw.

Greenhorn Complete the Campaign on Easy Difficulty.
100/100

Plate Tectonics Break off 25 Hunter backplates.
100/100

Captain’s Orders Complete Keyes.

Bad Gas Destroy 100 Grunt backpacks.
100/100

Double Trouble Complete Two Betrayals.

Protocol Dictates Action Complete The Library.

Disarmed Dismember 100 Flood parts.
100/100

This Stuff is Your History Complete 343 Guilty Spark.

Control Alt Delete Complete Assault on the Control Room.

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

Bee Thirty Complete Silent Cartographer.

Infiltration Anticipation Complete Truth and Reconciliation.

Installation 04 Complete Halo.

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

The Autumn Leaves Complete Pillar of Autumn.

Our Promise Complete the game on any difficulty.

Who Needs Guns!? Deal 3000 hacking damage in a single hack.

Escape Artist Unlock every escape hatch.

Sentinel Breach Take down the Sentinel.

Clean Up on Aisle Three Cleanse three or more enemies at the same time.

Challenge Master Complete all levels in Challenge mode.

Survival Star Get all stars in Survival mode.

Nightmare Over Complete your quest on Nightmare difficulty.

Awakening Fix up Diana.

Mission Unveiled Make it to Nexus Tower.

Top-Shelf Item Upgrade a weapon using Pure Lunum.

Round 'Em Up Defeat three enemies at the same time with the Lim Recycler.

Entrusted Memory Get the stop code.

IT'S OVER 6000! Deal 6000 gunshot damage in one second.

Blackout! Complete a Cabin Stamp Board.

Peekaboo Win at hide-and-seek.

Cradle Surveyor Reach 100% sector progress in a sector.

Replicating Extraordinaire! Complete an REM series.

You're Not Getting Away That Easy Defeat a Sweeper bot.

Another Pragmata Meet the trapped girl.

Wall? What Wall? Find a Holo-Wall.

Red-Zoned and Loving It Secure a Red Zone.

Mister Simulator Complete the main objective in a Training Sim.