MegaDethMayhem

You Only Get One First Time Complete your first Event.

I Prefer Them Alive Rescue two female survivors at the cathedral.

Cycle of Violence Use 100 Quick Gadgets while in free flow combat.

Out Before Dessert Complete the "Happy Birthday" videotape within 5 minutes.

The Golden Bot Rescued the Special Master Bot at the top of the Golden Statue.

Ten plus foot-mobiles Kill at least 10 enemies with one Predator Missile.

On the Go Craft special ammunition 50 times

I'm all that! Win a ranked match in every multiplayer mode.

Personal Bag Of Tricks Finish a game session with an ability set that you customized in Multiplayer.

Riddler on the Rampage Obtain a key by completing the fourth Riddler trial.

Astro-nomical! Earned all Trophies. Well done and see you in Astro's next adventure!

A Road Less Traveled Discover a "?" Bonus Path.

The Cult Save the sacrificial victim and lock up the executioner in GCPD.

Bolt From the Blue In the Main Campaign, killed 5 enemies with a headshot while riding a Sky-Line.

Strange Bedfellows In the Main Campaign, killed 20 enemies using allies brought in through a Tear.

Vive le Revolution Liberate a Province.

Underwater Archeologist Collect 5 underwater Artifacts

Dedicated student Reach level 25.

Soap on a Rope Storm the gulag.

The Burning Question Obtain a key by completing the fifth Riddler trial.

1st Place at the Science Fair Create all items that contain Chem Fluid and Strong Chem Fluid.

That's a Spicy Meat-a-ball Kill an enemy by attaching a Remote Bomb to them and detonating it.

Unnecessary Roughness Use a Riot shield to beat down an enemy.

Hack & slash Kill 250 zombies using edged melee weapons.

In-depth Investigations Find 80% of the Collectibles in the Investigations Sector
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Some Like it Hot Kill 6 enemies in a row using a thermal weapon.

The Primal Riddle Obtain a key by completing the sixth Riddler trial.

Scar of the Bat Cure the doctor.

Desperate Times Execute the plan to help the Americans.

Supernatural Born Killers Defeat 5 Descendants With a Sniper Rifle

In the Moment Kill 10 enemies while Focus is active

Days of Fire Extinguish the fires in Gotham City.

Get Used To It Die for the first time.

Whiskey Hotel Take back Whiskey Hotel.

Savior Save 5 people besieged by zombies.

Savage Metal Smash 10 militia transport vehicles off the road without using the immobilizer.

Touch of Death Apprehend the weapons dealer and lock him up in GCPD.

Out of the Frying Pan... Complete the mission in the airplane graveyard.

The Pawn Assault Makarov's safehouse.

For the Record Complete the single player campaign on any difficulty.

To put it bluntly Kill 250 zombies using blunt melee weapons.

Specialized Earn all Skills in one category

They're ACTION Figures! Collect 3 figures.

Good Samaritan Complete 8 Side Missions

Historian Find every audio diary

Getting it in Gear Earn at least 3 Gears in a Challenge.

Tomb Raider Complete all main game Challenge Tombs

Humanitarian Kill 50 human enemies.

Surge Protector Kill 50 enemies with Surge
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How many days exactly? Play Dead Island - Definitive Edition at least 28 days after starting it for the first time.