RiddleThemThis

Quantity Over Quality Level up 5 characters! Up to level 5 should do the trick. When it comes to food and fightin', it's quantity over quality, mate.

Dance of the Praying Mantis Throwing enemies around makes handling big groups easier. (Ignored in training mode.)
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How the West Was Done Complete all plot missions, side missions, and crew challenges on Gehenna.
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Cycle celebration Turn all altars.

Know My Name Get on the Leaderboard for every Feat

Faster Than Light Achieve a 10x point multiplayer in "Jimmy's Vendetta".

Every player succeeds in a Party Round Awarded when every player successfully completes a Party Round.

Avid reader Read all letters.

Final ascent Read all of Bianca's journal entries.

Antique gallery manager Activate all frescos.

Common ground Complete all cairns.

QForce Master Unlocked for earning the rank of Master.

Sound archeologist Listen to all shells.

Splinter Ray Go through "Mansion of the Deep" without crossing any light from a Dark Sentry or touching any laser

I just love them! Win all the creatures

Ballast Obtain all trophies in the game.

Complete a Small Party Awarded when 2-4 players have completed a Party.

Fustercluck Off Complete all side missions and crew challenges in Krieg's Mind.
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Friends no more Complete a race in Split Screen mode.

Ferocity, speed, strength, accuracy Reach a level score of 20 000.

Be on the Blue team for Online Road Rage Awarded for taking part in an Online Road Rage as a Runner on the Blue Team.

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

Campaign Gold Obtain all 108 medals on the original Arkham City campaigns (as Batman)

Tenacity Purify Guardian Silva

Fine Form! Customize a Form for the first time

Miasma Manager Activate all mistles

Playing With Fire Entered into intimate relationships with over two female characters.

Food for Thought Viewed more than 20 Table Talk scenes.

Muk Yan Master Obtain the Wood talisman.

Scratch me! Win and scratch all the lucky tickets

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

International C License Complete the International C License.

Be on the Red team for Online Road Rage Awarded for taking part in an Online Road Rage as a Chaser on the Red Team.

Driving Amateur Reach Driver Level 5

Perfect Knight - Day 2 Complete every challenge in Arkham City - Main Story, Side Missions, Upgrades, Collectables, New Game Plus and Riddler's Revenge (as Batman)

Every player succeeds in every Party Game Awarded upon completing a Party in which every player successfully completes every Game of every Round.

I'm number 1 Win 1 Tower Battle

When Therapy Makes It Worse Break through the barriers of self-deceit

Ye Who Enter Open the gates to Vaulthalla.

Blighted One Reach level 50

Shocking Discovery! Collect all the items (Batteries) on Lockdown

Bronze Addict Win all the Bronze Cups from the paintings

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

The Past as a Present Get what you want

Single Perfect Without forming a Dual Fighter, get a Perfect Bonus on a certain Challenging Stage!

Gold Standard Get five gold medals in Challenge Mode

Stage 19 Perfect Get a Perfect Bonus on the Stage 19 Challenging Stage!

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

I Like to Keep My Options Open Unlock every Grappling Hook Mod