Perrsevering

Eggstra Nemesis! Complete the Egg-Stra XP challenge and then activate a generator in the Nemesis DLC package.

TBoGT: Past the Velvet Rope Score 80% or above in all missions. (The Ballad of Gay Tony)

Hireling Commander Reach level 10 with all Mercenaries.
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Splicer God Complete the "Wrath of the Machine" raid on heroic difficulty.

TBoGT: Gold Star Score 100% in all missions. (The Ballad of Gay Tony)

The Final Chapter Find all 7 story related intel files in Exodus.

The Grand Tour In Revelations, visit every unique location within 2 minutes.

You Wish Hit an Ancestor with a Hypno Knife in Regular or Hardcore difficulty.

Kurast Cleanser Complete 25 runs of the Kurast Undercity.
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Wield a Fist of Iron In Gorod Krovi, wield the Gauntlet of Siegfried.

Gone Spelunking Retrieve all 55 Audio Logs and 25 UrbEx Diaries the Underground.

Blown Away In Gorod Krovi, kill 10 zombies at once with the Guard of Fafnir.

One Man's Poison... Use the cure station to kill 5 host zombies at once in Infection.

From Beyond Memorize Seven Sigils at Once

20/20 Upgrade 2 weapons to level 20 in Outbreak.

Fire Mission In Gorod Krovi, kill 8 zombies with a single Dragon Strike.

The Beast Below Reach Underground Rank 40.

Memory Memorize a Sigil

The Shadow Out of Time Craft an Item Using Eldarium

The Temple Visit a Leyshrine

The Haunter of the Dark Reach the Tower

In the Vault Explore a Vault

Wardrobe Change In Revelations, wear three different hats.

The Silver Key Obtain ?????

The Other Gods Draw Forth the Most Powerful Surge

Beyond the Wall of Sleep Enter the Maelstrom

The Outsider Defeat a Surge Summons

Timing is Everything Kill the final 3 Ancestors within 10 seconds of killing the first Ancestor in Regular or Hardcore difficulty.

Popcorn Cook 50 zombies with the Magnetron in Infection.

Always Hard Kill the final Ancestor with a relic active in Hardcore difficulty.

Tools of the Trade Craft the Virus Filter and Flare Gun in Survival mode.

The Gem in the Tower Explore the Isle of Siptah

Cryogenic Slumber Party In Moon, complete Richtofen's Grand Scheme.

Vaporeyezed In Gorod Krovi, use the Gigant Beam to kill 20 Zombies in one activation.

Indirect Fire Kill 100 zombies with traps in Infection.

Tormented Massacre Defeat 1000 Elites on Torment IV.
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Game Over, Man! Call in a rescue in Outbreak.

Bane of the Khazra Complete the Rise of the Khazra Dark Citadel.
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Love Tap Kill a Goliath with a melee attack in Infection.

Smooth Operator Defeat Oz in Descent.

Climbing the Corporate Ladder Survive until round 25 in Infection.

Wonderful In Revelations, kill 10 enemies in one shot with each wonder weapon.

Nah, I'm Good. Reach round 7 without anyone opening a door in Descent.

Born Survivor Successfully survive and escape in Survival Mode.

Small Consolation In Shangri-La, use the 31-79 JGb215 on each type of zombie.

Objectively Good Capture an objective, build both fortifications and unlock both perks

Viktorious Revenge In Gorod Krovi, complete all solo Trials in one Zombies game.

Time Attack In Gorod Krovi, complete Time Attack: Round 20.

Hugs! Kill 20 enemies in a single burst of Explosive Touch in Carrier.

Overachiever In Origins, complete all 4 Challenges in one game.