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Sisters of Athena Endurance Co-op Challenge: Kill a combined total of 25 enemies in a single Expedition

Sisters of Artemis Endurance Co-op Challenge: Kill a combined total of 10 dangerous animals in a single Expedition

For the Night is Dark Endurance Co-op Challenge: Clear 3 Enemy Camps at night in a single expedition

Teamwork Endurance Co-op Challenge: Warm up from freezing by standing next to a campfire lit by your partner

Communication Skills Endurance Co-op Challenge: Kill 5 enemies that have been marked by your partner

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

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

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

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

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

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

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

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

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

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

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

Skilled Agent Complete Separate Ways on Hardcore mode or higher.

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

The Perfect Mission Complete Separate Ways on Professional mode.

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

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

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

Ada the "S+"py Complete Separate Ways on Professional mode with an S+ rank.

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

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

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

Smooth Operator Slide a total distance of 500 blocks on ice.

Decked Out Collect 50 unlocks for a single hero.

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

Pet the Dog "Who's a good wolf? You are! Yes, you are."

Incoming! Kill 3 enemies with a single use of Bastion's Configuration: Artillery in Quick or Competitive Play.