Oh-Meg

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

Supernatural Born Killers Defeat 5 Descendants With a Sniper Rifle

Hold Still Please Slow 100 Enemies with the Amulet of Uroborus

Mile High Club Sky dive to safety on Veteran difficulty.

Freeware Unlock every Skill in the Skills Tree

The Wedding Complete all levels in The Wedding

Epic Jump Quest Jump from the roof of 3 Count to the Nuke Plant, without touching the ground or other rooftops.

Faithful Heir Collected thirteen royal arms.

Secret Plans Completed Special Operation 217

Surprise! Assassinate 10 guards from hiding spots

Destroyer Fully upgrade the Jackdaw.

Astral Plumbing Discover the Astral Plane restroom

Shopaholic You have collected half of the available costume sets.

Road Rage Complete every Criminal Convoy

Make it Rain! You've spent $500.

Everybody Knows Kyle Reach Survivor Rank lvl 12

Animal Cruelty You've farted on animals 25 times.

Conqueror Earn all Trophies.

Jeet Thrives Reduce threat to 0 in the Balefire Flatland region around Jeet's Stronghold

Broken Toys Destroy it all

Unlicensed Nuclear Accelerator Found the Arc Tool

The Shadow and the Flame Defeat a Shakiriyya in combat

Calling CQ Powered the Beacon

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

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

Underwater Archeologist Collect 5 underwater Artifacts

Sightseeing Reach the Old Town

End of Line Complete 40 Fixer Contracts

4 Bars Retrieved a working Uplink Module

Fashion Statement Apply dye to an outfit

Next Time Swim Faster Got eaten by an alligator

Flawless Freeflow Fighter Complete one combat challenge without taking damage

See You at the Party Defeated Richter

Cooking Expert Reached maximum cooking level.

Pounding the Pavement Kill 150 Aliens with the Stomp Super Power.

Weapon Master Get a kill with each type of handheld gun, explosive and launcher in the single player campaign.

Coup de Grâce Slay 25 zombies using finishing moves.
7/25

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

Scar of the Bat Cure the doctor.

Headhunter Headshot 20 guards with throwing knives

Multiple Applications Use Multi-Launch to hit 3 targets

Pied Piper Used the Arc Tool to activate a Stalker rack

Precious Cargo Located the Ark

Angel of Death Destroy a Titan with your Flight Core in the Campaign

Days of Fire Extinguish the fires in Gotham City.

The Smart Driver Complete a Scatter Death Run

Tortoise Toppler Defeated the adamantoise.

The Hands of a Thief Pickpocket 50 people

And Stay Down! Perform a ground execution.

How many days exactly? Play Dead Island - Definitive Edition at least 28 days after starting it for the first time.