Alienimator

Turnabout is Fair Play Kill 50 Cryptids with the Venom-X weapon in Nightfall in Regular or Hardcore difficulty.

Going Ballistic Kill 10 enemies with Ballistic Knife melee attack in ‘Rocket's Red Glare’ Operation.

No Stone Unturned Find all ‘secret’ collectibles.

Worst Nightmare Master the Worst Nightmare Dark Knight track

An honest mistake Kill an allied worm in an online match.

Tier One In a group of 4 finish an Operation on Challenge with 5 directives enabled.

Interagency Task Force Play through one entire mission with two other live players.

No Mo' Modi Get out of jail, but not for free

Campaign Wonder Obtain 114 medals on the original Arkham City and Robin Bundle Pack campaigns (as Robin)

Campaign Nightwing Obtain 114 medals on the original Arkham City and Nightwing Bundle Pack campaigns (as Nightwing)

Just Take the Pod Complete all New Horizon Expeditions.
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Annihilation Get 100 Elite Zombie Eliminations in Zombies

Played with fire Defeated the Keeper after changing his initial magic school to the fire type

Clean Sweep Complete the System Rift Jensen Story without killing anyone.

Harmonic in the FEBA Score a harmonic from the FEBA.

Insert Coin Complete all achievements in one game from The Arcade.

Short, Controlled Bursts Defeat all Xenomorphs in the Sulaco hangar bay without them crossing your barricade

Straw Purchase Gift a Mystery Box Wonder Weapon to a teammate and have them accept it

It's a Trap! In Shi No Numa, kill at least one zombie with three different traps in a single round.

Let it Snow Receive the Extreme Environment Suit (XE Suit)

LEGACY Complete all recordings

Spy vs. Spy In cooperative mode, prevent 10 attempts of picking up secret items.

141 Ready Complete the campaign on Veteran

Level 21 Unlock all weapons in the campaign mode.

A Just Cause Decide what to do with the Altered Biocell.

Song of Va'erä Ramunong Secure the song in Va'erä Ramunong.

King in the North Complete all Final Stand Assignments

Remember Me? Deal the winning blow with a resurrected worm.

Going Up… In The Darkest Shore, unlock the Ubersprengen.

Constellation Prize In IX, kill 9 zombies with a single uncharged shot from the Death of Orion

Safe Crime Finish 5 rounds in a row without getting any penalties in Arcade Mode.

Ancient tool, new purpose Defeated the Judge with a weapon dropped by the Keeper

Not One Inch In Gorod Krovi, complete a Lockdown Event.

Upping the Ante Kill the Kraken using a Relic in Mayday in Regular or Hardcore difficulty.

Drilling for Justice Assemble the cryonucleation tunneller - the cryodrill

Creepy Card Shark Tried every Creepy Treat Card in combat

Remember the Fallen Collect all 35 Dog Tags

Murder He Wrote Find all pieces of evidence behind the Saridakis murder.

Practical Mayhem Deploy an active skill in a mission, and have at least one other player use the results.

Dipped in Gold Purchase all Safehouse and Player Upgrades in Campaign

Live Die Reload Complete Extra Life Mode with 5 Extra Lives in your Inventory (Ancient Gods 2)

Song of Kxanìa Taw Secure the song in Kxanìa Taw.

Deadly Ballet In a three-player co-op game, make sure everyone scores at least one kill during Team Entry.

Ladder Goat Find Ladder Goat movie on the Fort level.

Master of Sword and Gun Complete a Chapter of the single-player campaign using only the Bolt Pistol and Chainsword.

Match Made in Hell In Blood of the Dead, complete a Gondola ride with the Warden

The circle is now complete Get to Rank 100

Game Over Beat Horde Mode

Hat Trick Kill 3 aliens with a single shot from the NX-1 Disruptor in Regular or Hardcore difficulty.

No More Mr. Nice Guy You pissed off everyone in Venezuela