RDT1

Trick or Treat You stealth killed a Nazi General while disguised.

The Whole Gang's Here Recruited all companions.

Duke or Dimwit? Defeated all waves in Duke and Dimwit Theater.

Carpe D.I.E.M. In Die Maschine, free the lost Decompressive Isotopic Estrangement Machine.

Now That's a Big F***** Gun Defeat 40 enemies with the SKULLFEST 9000

Passive Aggressive Get 3 kills with a single Sentry Bot

There Goes The Neighborhood All AA cannons destroyed

New Testament: Ch. 5-7 (Hard) Complete Chapters 5 through 7 on Hard difficulty.

Fight For That Inch Win your first league battle

Impulse Buyer! Purchase any 3 upgrades.

Yule Shoot Your Eye Out Destroy 10 Snow Globes in Santa's Workshop

30 Pieces of Silver Collect 30 precious silver rewards

Medic!  Revive your Co-Op partner 10 times.

The start of something big Win any mission, whether campaign or What-If

TWO heads Complete a mission (excluding New Blood) with a human partner

A friend in need Revive other players 50 times

Vehicular Carnage Complete Chapter 2 on any difficulty setting (Story Mode).

Platinum Trophy Obtain all Gold, Silver, and Bronze Trophies for Resistance 3

Curator Discover all of the collectibles in the Campaign.

We are the Spark Defeat 500 enemies as a hero on any Multiplayer map.

Fiddler on the Woof Defeat General Robo-Dog.

Fire The Afterburners Earn Platinum Medals during Verse 1 and Verse 2 of Chapter 14.

Treasure Fanatic Discover all of the Umbra Witches' final resting places.

Blood Sport Perform 100 melee kills

The Explorer Complete all optional missions.

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

Queen of the Bronze Age Collect 60 common bronze rewards

Urban Brawl Complete "Fight Zentrificiation" quest in Sundrop Hills

Smooth Criminal Successfully negotiate ideal terms with Yamagata.

The Hard Way Complete the game on Tomb Raider difficulty

Good Listener Take GLaDOS' escape advice

Root canal Defeated the Gorilla Boss

T-Bone: Looking For Trouble Complete all side investigations

Nothing Is Over! Defeat 'ALF: 0N50'

Points III Score 350,000 points.

Death's Door Unlock the Alchemist Room in Monster Ball

Combination Blow Land a 50,000+ point combo.

Kevorkian Complex You granted a dying man his final request.

Resurrect this! Score 5,000 with a single sniper round

Good Time in Level 1 Complete the first level while in Time Trial mode

Can't Stand Any Higher 100% Golds awarded in Challenge Mode

Fireworks In The Final Reich, retrieve the artifact.

Western Command You inspired the people of Paris Area 2.

Pocket Change Collect $1000 Vektan in a mission.

Survival of the Fittest Survive against Rutland for more than 5 minutes

Disco Inferno Kill all enemies without leaving the dance floor in the city outskirts

Silent Death You stealth killed 50 or more Nazis.

Flesh Re-animation! Regenerate with Splatter Siphon.

Skullblaster Master Defeat 50 enemies with the SKULLBLASTER

Vindicated Honor Raise your player level to 50. Level up that much and you'll be about ready to exact you revenge.