Unlock all other achievements.
Complete a Mission in Co-Op. (Local or Online)
Kill 750 Demons.
Kill 1500 Demons.
Kill 350 Demons as Master Sergeant Asher.
Kill 350 Demons as Agent Cross.
Complete the campaign on Easy difficulty or higher.
Kill 350 Demons as Corporal Harris.
Kill 350 Demons as Dr. Miller.
Kill 350 Demons as Private Chester.
Kill 350 Demons as Sergeant Malkov.
Kill 150 Demons with Explosives. (Excluding Weapons/Powers)
Kill 250 Demons with Powers.
Unlock all Powers.
Fully upgrade all of a Character's Powers.
Fully upgrade all Powers.
Invest 5 Crystals in weapon upgrades.
Complete the campaign on Standard difficulty or higher.
Firepower Invest 25 Crystals in weapon upgrades.
Add elemental damage to a weapon.
Fully upgrade a weapon's elemental damage.
Destroy an Enclave.
Destroy 10 Enclaves.
Unlock a Collectable.
Unlock All Collectables.
Complete the campaign on Inferno difficulty.
