Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
Apex Predator (20 points)	Reach a player score of 25,000,000.
Arachnophobe (20 points)	Defeat Vorus God Mech.
Armed & Completionist (20 points)	Use all weapons.
Behemoth (20 points)	Defeat GX-7 Destroyer Prototype.
Can't Homidecide (20 points)	Kill an enemy with every weapon.
Gangbuster (20 points)	Defeat AA-19 Combat Mech.
Giant Killer (20 points)	Defeat Vorus Centurion.
Guardian (20 points)	Defeat DF9 Sentry Mech.
Hardcore (20 points)	Complete single player campaign on Brutal difficulty.
Hoarder (20 points)	Find all weapons.
Juiced (20 points)	Unlock first Perk.
Overdrive (20 points)	Defeat Mk XII Heavy Mech.
Pitching Machine (20 points)	Defeat Vorus Primus.
Point & Shoot (20 points)	Find a new weapon.
Relentless (20 points)	1500 Total Kills.
Secured (20 points)	Defeat Security Turrets.
Showdown (20 points)	Defeat Vorus Gladiator.
Tenacious (20 points)	Complete single player campaign on any difficulty level.
Utility Belt (20 points)	Unlock all player perks.
When Titans Fall (20 points)	Defeat all Bosses.