Dunkelburk

Hangar 18 You found and read the secret message. Now you know too much...

Good Listener Take GLaDOS' escape advice

Kevorkian Complex You granted a dying man his final request.

Master improver Find all the secret Brotherhood arks

Dark collector Gather all the 30 Shadow gems

Stim-ply Amazing Healed 10,000 points of damage with Stimpaks.

The House Always Wins Completed The House Always Wins.

Angel May Cry Complete half of all Alfheim portals.

New Testament: Ch. 8-11 (Hard) Complete Chapters 8 through 11 on Hard difficulty.

Weedkiller Kill 5 Cysts in the Biology Building with a single poison gas cloud.

Master jeweler Gather all hidden magic gems

Roadkill Run over 10 Mutants

Booty Master Collect all the prize bubbles on the story levels

Play Complete all story levels without dying, with the exception of those levels that only end when you die

A Few New Tricks Use 5 different Quickfire gadgets in one fight as Robin in Harley Quinn's Revenge

Bomb Squad Defuse all bombs in 3 minutes or less

All or Nothing Completed All or Nothing.

Master fighter Buy all combos

Master Combatant Get 5 PvP kills.
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New Testament: Ch. 12-13 (Hard) Complete Chapters 12 and 13 on Hard difficulty.

Old-Tyme Brawler Caused 10,000 damage with Unarmed weapons.

Game of Bones Use Bone Armor to rip the bones from the Skeleton King.

What Is Dead Can Sometimes Die Kill 1,000 Undead enemies with corpses.

Crush Combo! Simultaneously crushed 4 enemies.

Bringer of Order Complete Act V with a Necromancer.

Umbra Elder Complete all Chapters on Hard difficulty.

Hack the Mojave Hacked 25 terminals.

I Need a Date Look at every page of a calendar in SP

The Path To The Heavens Discover all Alfheim portals.

New Testament: Close The Book Complete Chapters 14 through the Epilogue on Hard difficulty.

Waves of Thunder Defeat 7th Colossus

Maximum Mileage Buy a used car with 300,000km or more travel distance.

Record Fanatic Obtain seven complete Angelic Hymn Gold LPs.

Party Animal Drink all of the beers in the strip club

No Hard Feelings Save a turret from redemption

Trials – Chapter III Complete all the trials for Chapter III

The Hand of God Destroy two Romanovs in a row using only melee attacks.

Bog Walker Discovered all locations within Point Lookout

Drop Box Place a cube on a button without touching the cube

Flash! King of the Impossible Destroy four enemies simultaneously with the Lock-on Laser.

Operation Overlord II Complete Act 1 on Hard difficulty or above without using mission select.

Professional - 3 revolver headshots in a row Get 3 headshots in a row using the same clip of M4 Revolver ammunition

JACKPOT! Roll 4 Targets in the first round of Tombstones

Driving Music Use the Personal BGM function, and go for a drive while listening to your favorite songs.

True Perseverance Reach Level 50 with a Hardcore character.
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Devoted Protector Reach Paragon Level 200 with any character.
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Aliens Collect all Alien Artifacts.

Mechspert - Stomp 10 Helghast Stomp 10 Helghast with your Exoskeleton in Maelstra Barrens

Love the Bomb Caused 10,000 damage with Explosives.

Wall Scaler Defeat 8th Colossus