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Confidence Building Complete all test chambers in the Mass and Velocity co-op course

Rock Portal Scissors Win 3 co-op games of rock-paper-scissors in a row

Bridge Building Complete all test chambers in the Hard-Light Surfaces co-op course

Narbacular Drop Place a portal under your co-op partner while they are gesturing

Air Show Perform 2 aerial gestures before touching the ground in co-op

Gesticul-8 Perform all 8 gestures of your own volition in co-op

Obstacle Building Complete all test chambers in the Excursion Funnels co-op course

Can't Touch This Dance in front of a turret blocked by a hard light bridge in co-op

You Saved Science Complete all test chambers in all courses of co-op

Girl in the Snow Travel to Reisum

Empty Gesture Drop your co-op partner in goo while they are gesturing by removing the bridge under them

Nemesis Defeat the Final Boss

Four Ring Circus Enter 4 different portals without touching the ground in co-op

Asking for Trouble Taunt GLaDOS in front of a camera in each of the five co-op courses

Other Voices Listen to all the Recordings in Ward Prime

Lockdown Visit the Homestead Basement

Iron Grip Never lose a cube in Chamber 6 of the Mass and Velocity co-op course

Party of Three Find the hidden companion cube in co-op test chamber

Portal Conservation Society Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements

Hard Bargain Make a Deal with Sebum

Triple Crown Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each

Still Alive Complete Course 4 with neither you nor your co-op partner dying

BOOM! Who Needs a Headshot? Kill 5 Walkers with One Explosion

Fall of the Iskal Defeat the Iskal Queen

Ooh, Shiny! Distract 50 Walkers with Items

Nobody Can Kill Merle but Merle Complete the Second Act

Mind if I Borrow This? Pull a Bolt From a Walker Then Kill Them With It

Crash Course in Brain Surgery Kill 100 Walkers while Grappling

Moving to the 'Burbs Complete the Third Act

Next Step: Bullet Belt Fire 300 Bullets

Get Out of Dodge Complete the Final Marked Destination on the Map

The Hunted Becomes the Hunter Kill 5 Walkers in the Cabot Ridge Creek Bed

I Used to Be a Human Like You Shoot a Walker in the Knee with a Bolt

Still Not Buying a Hybrid Consume 250 Fuel

This Is How Hot Dogs Are Made 10 Walkers Killed with Saw Blades in the Logging Camp

Have a Nice Trip! Kill a Walker That Is Falling Due to Dismemberment

They're People, Too! Complete a Marked Destination on the Map without Killing a Walker

Say Hello to My Little Friend Complete a Marked Map Destination Using Only Firearms

Guys Night Out Arrive at Final Destination with Only Male Survivors

Good Samaritan Complete 25 Optional Objectives

Porcupine Shoot a Walker with 10 Bolts without Killing It

Rosie the Rampager Arrive at Final Destination with Only Female Survivors

That's a Nice Swing You've Got Kill Walkers Using Every Melee Weapon

It's Gotta Be the Brain Dismember All Limbs of 5 Walkers

I Can Handle This Myself Enter Sherwood Without Any Survivors

They Know Me at the Range Kill Walkers Using Every Ranged Weapon

Need More Spots Up Front Dismember 250 Limbs

True Dixon Complete a Marked Destination on the Map Using Only the Crossbow

Down to My Last Complete the Game with Only 1 Firearm and 1 Bullet Left in Your Inventory

Been Everywhere Complete All Marked Destinations on the Map