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Alone Time Endurance Co-op Challenge: Spend at least one day more than 60 meters apart

"Teamwork" Endurance Co-op Challenge: Collect an Artifact while your partner is down

Get Away from Her! Endurance Co-op Challenge: Kill an enemy melee attacking your partner

High Five Celebrate your cooperative calibration success

No One Left Behind Endurance Co-op Challenge: Revive a player 3 times in a single expedition

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

Echoes of the Fast Obtain a Bronze, Silver, or Gold medal in Time Attack for the Forge of Destiny Challenge Tomb

Skillful Raider Endurance Challenge: Open 5 Codices or Sarcophagi without getting caught in a trap

Good Listener Take GLaDOS' escape advice

Saving the Day Save 10 survivors

Taffer's Delight Completed Burial at Sea - Episode 2 in 1998 mode.

Echoes of the Furious Obtain a Bronze, Silver, or Gold medal in Score Attack for the Forge of Destiny Challenge Tomb

Rope-a-Dope In CitC, knock an enemy around the city with Undertow, then knock him off the edge of the city.

Rooftop Ruffian Defeated all waves in Raven's Dome.

Museum Curator In CitC, unlocked all Gallery items.

Jumpmaster Be the Jumpmaster 5 times

Missile Defense System In CitC, killed an enemy with splash damage by shooting a rocket out of the air.

Master and Apprentice Endurance Co-op Challenge: Escape the forest after surviving 10 days with at least 20 Artifacts

Float Like A Butterfly Obtain a Bronze, Silver or Gold medal in Time Attack for the Path of Huracan Challenge Tomb

No Hard Feelings Save a turret from redemption

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

Go Cart Obtain a Bronze, Silver, or Gold medal in Time Attack for The Sixth Seal Challenge Tomb

Sting Like A Bee Obtain a Bronze, Silver or Gold medal in Score Attack for the Path of Huracan Challenge Tomb

Howl Long Obtain a Bronze, Silver, or Gold medal in Time Attack for the Howl of the Monkey Gods Challenge Tomb

Rapids Obtain a Bronze, Silver, or Gold medal in Time Attack for the Slayer's Gauntlet Challenge Tomb

Organ Grinder Obtain a Bronze, Silver or Gold medal in Score Attack for the Howl of the Monkey Gods Challenge Tomb

Zip It Obtain a Bronze, Silver, or Gold medal in Time Attack for the Zipacna's Craving Challenge Tomb

Chel Game Obtain a Bronze, Silver, or Gold medal in Time Attack for the Mother Protector Challenge Tomb

Cannonized Obtain a Bronze, Silver, or Gold medal in Score Attack for The Sixth Seal Challenge Tomb

Invincible Defeat Ustanak without anyone on your team being captured.

Go Fish Obtain a Bronze, Silver, or Gold medal in Score Attack for the Slayer's Gauntlet Challenge Tomb

Hand of the Prophet Defeated all waves in Emporia Arcade.

Father of the Month Give Katey a gift

Chak Attack Obtain a Bronze, Silver, or Gold medal in Score Attack for the Mother Protector Challenge Tomb

Offshore Count Obtain a Bronze, Silver, or Gold medal in Score Attack for the Zipacna's Craving Challenge Tomb

Easy Pickings Eliminate all players as Ustanak in less than a minute.

Serve With Honor Complete 1 Service Assignment

Team Building Complete all test chambers in the Team Building co-op course

Adventure Besties Endurance Co-op Challenge: Escape the forest with 5 Medium and Large Artifacts

Sergeant-at-Arms In CitC, got a kill with each weapon and vigor (except Bucking Bronco).

Team Player Respawn a teammate

Held Captive Defeat Ustanak with only one Agent remaining.

Preservation of Mass Break the rules in Test Chamber 07

Killer Combo Achieve a 30-combo chain.

Vigilante Justice Defeat 5 psychopaths

Apprentice Rising Reach level 25

Last Man Standing--Again Win five times in a row.

Kung Fu Fighting Survive to the end only using physical attacks.

The Ol' One-Two In CitC, used all eight different vigor combos to deliver the killing blow on an enemy.