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The Force Complete Zone 18 without upgrading weapons.

Compulsive Hoarder Obtain at least 100 hidden treasure items.

Tycoon Complete the GFO Oil Rig mission.

The third faction Rescue all the Buddies from their respective predicaments

Nothing More to Collect Unlock all the playable characters and bonus items.

Pied Piper of Squirreldom Have 5 squirrels following you around at the same time

Just Like Old Times Dispatch the professor with a shot to the groin.

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

Going to the Vet Earn the "Veteran" Challenge Collection.
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Acidic Alchemy In IX, Get a kill with the Acid Trap in each of its craftable locations

Up Up! Leap of Faith In the Closet

Get'em George Learn to standup for yourself

Last Blood At the end of Guns of Stygia, kill all the enemies on the walkways before the explosions do

Three's a Crowd Finished Chapter 3

ARCHIVIST Collect all documents

Blood Rights Kill Satan with Samson

By the Skin of Your Teeth Reach the finish line and win with 1% or less of your fuel remaining.

Flyswatter Destroy all helicopters in the "Vertigo" Special Ops mission.

Closing the Experiment Log Earn ALL of the platinum Flashback Relics

Show Off Win a race by crossing the line backwards

It's time for your medicine Kill all the Residents with an Overdose Syringe

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

Top Of The World How far can you see

Legendary Hero Reach Reputation 5 with any Hero.

FINE PLAY! (Opening Boss) Achieve all FINE PLAY! technical bonuses in the Opening Stage boss battle.

Perfect Date Finish a level without taking damage.

The Spice of Life Use three different types of Yamato weapons in a boss fight.

Egg-stra Devastation! Complete the Egg-Stra XP challenge and then destroy a hive in the Devastation DLC package.

High Score Score 800,000 points in one game -- with Game Settings set to Hardcore.

Skirmish - Chapter XIV Finish the levels from Chapter XIV in Squire difficulty

Aries B Solved the second Aries riddle

Virgo B Solved the second Virgo riddle

Forgive me, sensei Kill Sanjuro Demon without getting hit

Untouchable Complete a whole chapter without dying and using a shrine

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

Elevator Out of Order Reach the roof in 'Highrise' under 45 seconds

Views From the Abyss STU: Complete "The Spider's Thread" mode.

Barrel of laughs Kill 20 enemies with barrels

Extreme Manhunt Complete a Seasonal Manhunt mission on Challenge difficulty or above.

Breathing Room Kill a Viper who is strangling a squadmate

Don't make me pull the trigger! Survive for 5 minutes in Demolition mode

The First One is the Hardest Get your first 1,000,000+ combo

Prime Directive Shatter Skeletron Prime.

Part IV Complete Complete the four chapters of Part IV.

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

Pinnacle Complete the "Vertigo" Special Ops mission on Veteran difficulty.

Spiritually Attuned Make 100 Psychic Links (Share or Steal)

Determined Don't use any hints to finish the game.

Tumbler Perform an impressive Barrel Roll

No Time Wasted Scored a goal within 3 touches after a quick restart