Complete "The Drop."

Complete "Church of the Damned" on any difficulty.

Kill 50 enemies with a single heavy weapon.

Open a stash using the vehicle's winch.

Collect 10,000 Sludgite.

Complete "Demon Bait" on any difficulty.

Complete a mission without any of your teammates getting incapacitated.

Deal 100,000 damage to enemies' weak spots.

Complete "Catch and Kill" on any difficulty.

Finish a mission while carrying the Sludge Seed.

Complete a mission without damaging your teammates.

Refuel the gas tank 30 times.

Kill 100 sludge tendrils.

Upgrade a weapon to its maximum level.

Avoid capture by a Snare after being its target.

Run over 1,000 enemies with a vehicle.

Prevent enemies from damaging the church gates in "Church of the Damned."

Kill 15 enemies in a single shot with the Fireball ability.

Drive each vehicle type at least once.

Travel 50 km total in any type of vehicle.

Restore 100,000 HP to vehicles.

Kill 300 enemies with Nuker explosions.

Overheat a machine gun 10 times.

Complete "High Octane" on any difficulty.

Restore 10,000 HP to teammates using the Healing Aura ability.

Kill 1,000 enemies by blowing up fuel barrels or gas canisters.

Kill 500 enemies using a Defender's barrier.

Kill 53,599 enemies.

Kill 1,000 enemies using an Operator's drone.

Complete "Deliver Us" on any difficulty.

Reach maximum level with every class.

Kill 5,000 enemies with melee weapons.

Complete any mission with 3 players from your in-game friend list.

Complete "The Pit" on any difficulty.

Kill 100 enemies using gas canisters as melee weapons.

Complete "Impasse" on any difficulty.

Set 30 enemies on fire with a single Molotov cocktail.

Complete "Church of the Damned" on Very Hard difficulty.

Upgrade 19 weapons to level 2.

Complete "Deliver Us" on Very Hard difficulty.

Complete "The Pit" on Very Hard difficulty.

Complete "Root of Evil" on any difficulty.

Complete "Root of Evil" on Very Hard difficulty.

Complete "High Octane" on Very Hard difficulty.

Complete "Demon Bait" on Very Hard difficulty.

Complete "Impasse" on Very Hard difficulty.

Complete "Catch and Kill" on Very Hard difficulty.

Complete all missions on Very Hard difficulty.

Complete all missions on any difficulty.

Complete "Root of Evil" without a sludge infection.

Kill a Snare after it grabs a teammate but before it damages them.

Complete a mission on Very Hard or Insane difficulty without taking damage.

Kill a charging Goon with Combat Gear.

Complete a mission on Insane difficulty without getting incapacitated.

Kill a Slob using a melee weapon.