Wellets

Walk Without Rhythm Dismantle the Destroyer.

Four's a Party Play 3 games in the Free-for-All matchmaking queue.

Gong like the Wind In IX, defeat all 8 challengers summoned by a gong within 5 minutes

Campaign Kitty Obtain all 108 medals on the original Arkham City campaigns (as Catwoman)

Public Relations Complete a Brand Exposure objective in Career Mode

Barrel Rider Ride a barrel in the spacerig for three seconds.
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Stowaway In Voyage of Despair, spend 5 consecutive rounds in the Cargo Hold

All Talked Out Hear every hint.

Beast Friends Forever Paint Trico's entire body.

Act 1 Cleaner Complete all Act 1 maps on Nightmare difficulty.

Shining Platinum Reach Platinum 1 rank in COM Battle.

West Side for Life In Blood of the Dead, reach Round 20 without leaving the West Side of the island

In the Belly of the Beast In Zetsubou No Shima, survive getting consumed.

Enemy Breaker Defeat 50,000 enemies.

Extracurricular Beat any bonus level

Treasure Hunter Find 100 treasure chests.

A Can Of Worms Play Trial of the Worm for the first time.

Item Hunter Obtain 10,000 items from Music Stages.

I Know a Shortcut In Voyage of Despair, take every fast travel path in a single game

Taking Flight In Gorod Krovi, ride a Dragon.

Standard Chain Master Clear 50 songs with a Full Chain on Standard.

Acidic Alchemy In IX, Get a kill with the Acid Trap in each of its craftable locations

Chimp on the Barbie In Ascension, kill a space monkey with a fire trap.

I Got This In The Darkest Shore, survive the initial beach rush without using any machine gun turrets.

A Little Pack Here, a Little Punch There In Voyage of Despair, use the Pack-a-Punch at every possible location in a single game

Burgertown Escort Service Rescue 1 survivor in Infection.

Untouchable Emissary Reach the end of the game without a game over.

Der Meisterbogenschuetze In Der Eisendrache, obtain all of the ancient bows.

Re-Armed Receive Zero's arm part in Mega Man X.

Act 2 Cleaner Complete all Act 2 maps on Nightmare difficulty.

Double Vision Trounce the Twins.

High Score In Zombie Rush, obtain a Personal Score of 250,000

Wired Up Place 100 wires.

Proud Maestro Clear all songs on Proud.

Wishing for the Best Complete the "Last Wish" Raid.

Come On And ... Slam 10 zombies at once in Outbreak.

A Clean Bill of Health Have a single character affected by all status ailments (both beneficial and detrimental).

Act 4 Cleaner Complete Act 4 on Nightmare difficulty

It's Over Defeat Wolf Sigma in Mega Man X.

Harmonic Convergence Pick up all traveler instruments simultaneously with your signalscope.

Appease the Volcano Gods An NPC is destined to die in a trial by fire.

Two's Company, Four's a Party Complete any Adventure level with 4 players.

Multiplicitous In Zombie Rush, get your score multiplier up to 100

Alright, Alright Survive until round 10 in Infection.

Big Sit Ride the chairlift

Survivor Survive until Round 25 in Outbreak.

PC Load Letter Use the 3D printer 15 times in a single match in Outbreak.

Prime Directive Shatter Skeletron Prime.

ARCHIVIST Collect all documents

Nightwing Revenge Obtain 78 medals on the original Arkham City and Nightwing Bundle Pack ranked maps (as Nightwing)