Samarium

Stargazer Unlock 15 astrariums in a single playthrough.

Indomitable Hunt 50 tempered monsters.

Close Combat Specialist Kill 100 enemies with melee attacks.

“Worlds of Hurt” – Expert Rescued the Little Sister in “Worlds of Hurt” in under 15:00, on Medium or higher difficulty

Gazebo Pay tribute to Jessamine one last time

I Felt Your Presence Witness the cult's meeting

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

Master of the Mojave Discovered 125 locations.

Complete your 1st Party Round Awarded when you complete the 1st Round of your 1st Party.

The Cockerel Crowed Long and short, far and near, each span has its year.

Herbalist Reached the Max Herbalism level

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

How the West Was Done Complete all plot missions, side missions, and crew challenges on Gehenna.
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Dose of freaky ghost! Capture a scary ghost in any Ghost House level.

Arkham City Lockdown Defeat every Villain With Batman

Aerial Dance Defeat 5th Colossus

Light up the Manhattan Spirit during an Online Challenge Awarded for using the flashing lights of the Manhattan Spirit during an Online Freeburn Challenge or Timed Challenge

Mr. Green Thumb Fully upgraded the Grow House

The Royal Protector Finish the game with Corvo Attano

Giant Crown Collector Obtain a gold crown for 10 or more monsters that appear from low or high rank.

Warp Mastery ME1: Use biotic Warp 25 times

No Assistance Required! Completed a race without any assist settings.

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

Well Balanced Breakfast Simultaneously had bonuses for meat, carbohydrates, sugary drink, caffeine, and alcohol.

Impossible Mission Succeeded at 3 dialog conversation checks with a single disguise.

If you don't move, it won't see you. Make the huge outdoor monster look down at you in Mini Bots (playing as the VR player).

Bladesman of Legend Defeat Gilgamesh.

Flaming Fury The golden child brought fire and smoke; when they cleared, the family broke.

A Floral Feast Feed carnivorous plants with three or more different kinds of treats

Piano Virtuoso Play all six Piano Outreach Association songs well enough to receive remuneration.

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)

Silence is golden Stop the music in the end sequence after the saloon blew up (playing as the VR Sheriff).

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

Barrier Mastery ME1: Use biotic Barrier 25 times

I just love them! Win all the creatures

Sorry, we’re DEAD In Shadows of Evil, kill 10 zombies that are inside of a store in one game.

Howlers ’til the End Side with the Howlers in the Dust District

Love Them and Leave Them Drive every Car

Trick Arrow Skills Shoot a Lizard with a Special Arrow

Return to Sender Completed Return to Sender.

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

Regal Completely upgrade one throne.

Eregion Reforged Build all the Forge Towers in Udun.

Hardcore Complete the game in Ranger Hardcore mode.

Are You Trying to Get Rid of Me? Find 30 unique reactions to the Spoon

Pacifist Clear the "Intel Operative Rescue" Side Op without killing a single enemy

Into The Pitt Completed "Into The Pitt"

Instigator Start a Spectated Arena Fight in a Settlement

Occult Carver Craft 10 Bonecharms

Damping Specialist ME1: Use Damping Field 25 times