Full Mission Gameplay...

Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
Another Bug Hunt	Eliminate 10000 Xenomorphs.	60
Canary	Complete the "Rock Bottom" Campaign.	20
Custom Made Marine	Complete 5 missions with the Specialist Kit.	20
Decommission Mission	Eliminate 1000 Combat Automatons.	40
Fervent Warrior	Complete a mission on Insane Difficulty.	60
Fully Loaded	Equip a weapon with all attachments, including an Augment.	20
Hardened Trooper	Complete a mission on Intense Difficulty.	20
Head Hunter	Get 1000 Headshot kills.	40
Hell and Back	Level a weapon to four stars.	40
How Do You See Out Of These Things?	Collect 10 hats.	20
It's a rescue mission, you'll love it!	Complete the "Rescue and Recovery" Campaign.	20
Legionnaire's Service Medal	Complete all Campaigns on Casual or higher difficulty.	60
Maxed Out	Fill every slot in a perk board.	20
Next Top Marine	Equip cosmetics on your head, torso and legs.	20
Noble Soldier	Complete a mission on Extreme Difficulty.	40
Not Just For Decoration	Equip at least one attachment on a sidearm.	20
Overly Attached	Collect 50 weapon attachments.	60
Pure Professionals	Complete a mission on Intense Difficulty or above without anyone taking friendly fire damage.	80
Purge the Unclean	Eliminate 1000 Pathogen.	40
Reckoning	Complete the "Final Endeavor" Campaign.	20
Seasoned Veteran	Level a Kit to Rank 10.	40
Spilled Milk	Eliminate 1000 Synthetics.	40
The Story of the Quarry	Complete the "Ancient Anomaly" Campaign.	20
Voided Warranty	Collect 5 Augments.	40
Wave Goodbye	Survive 5 waves in Horde Mode.	20
Welcoming Committee	Complete the "Prologue" Campaign.	20
Well Stocked Arsenal	Level 10 weapons to at least two stars.	40
Worst Party Ever	Complete the "Boarding Party" Campaign.	20
Worthiness Tested	Attempt a Challenge run.	20
Yellow Makes It Shoot Better	Equip a colorway and three decals onto a gun.	20