Here are some achievements for Campaign:


Image credit to DeathBlade182

PEDAL TO THE METAL
- Use an Adrenaline to gas up the car quickly, and escape the atrium before the Tank arrives.

THE PRICE IS RIGHT
- Kill Infected with the same amount of your teammate (one player is enough) at the end of the credits in Dead Center.

SHOPPING SPREE
- Finish the Mall without taking damage to Special Infected.


Image credit to Idkmybffjil

I CAN'T SEW YOU
- Kill the Boomer while blinded and without taking any damage on sewer part.

RUNAWAY BRIDE
- Kill the Bride Witch using only Molotov without taking damage to her in Expert mode.


Image credit to Goldenboy666

DODGEMED
- Avoid the Charger while he charges and let hits a bumper car.



Image credit to ChazBillYT

CHILL FRONT
- Find a key to open a developer's room.

LZ IS COLD
- Escape through APC.

MIKE COOLA
- Convince Mike to join you to escape.

STAY FROSTY
- Find five snowman in game.



Image credit to Five Dog

BURNING WHEAT
- Burn 100 Infected on a cornfield in a single fire.


Image credit to Five Dog

FRENCH FRY-CIS
- As Francis, burn Bill while he's restarting a generator.

THREE-ATHENING THE BULLY
- Kill a train car Tank within 3 minutes or less using only melee weapon.


Image credit to (not sure who[imgur.com])

???*
Roll 3 toilet papers on the slot machine, then place it on the pedestal.

BOOTSY'S LUCK*
- Roll 3 Tanks on the slot machine.

HIGH ROLLER
- Beat highest score in the roller coaster shooting gallery.

ITS OVER*
- Beat the campaign.

JigSAW
- While on the puzzle steps, kill 10 Infected with Chainsaw.

MINED-OUT*
- Beat the boat maze without it getting destroyed.

NATURAL GAMBLER*
- Roll 3 coins on the slot machine.

NICK OF TIME
- Roll 3 Nicks on the slot machine.

SMACKDOWN
- Beat the Tank under 3 mins on the Sis Sis Land Arena.

TANK RUSH
- Kill the Tank while in Adrenaline mode.

THE BEST ENDING*
- Roll 3 Bills on the slot machine (1/1000 chance to get secret ending).

ToTANKlity
- Beat the Tank without any taking damage on the Sis Land Arena.

UR DOIN GR8*
- Fail a chapter 43 times.

* - already in in-game achievements


FAVORITISM
- Use only a specific primary weapon you used from start to finish. (The exception is tier 2 because they don't spawn at start, unless on some campaigns that spawns tier 2 early.)

Here are some achievements for Versus:



MUDDY and BOOMY
- As a Boomer, blinded a Survivor while a Mud-Man is blinded it.


BOARDOM
- As a Tank, punch a Survivor to a billboard sign.

CAROUFUN RIDE
- As a Jockey, drag the Survivor to the carousel while activates.

HIGHLY SCREAMS
- As a Hunter, scream on Microphone on concert.

Here are some achievements for Survival:



ROCK AND ROLL OUT
- Get a bronze medal while staying on concert hall without leaving a platform.



Image credit to Randompeeponinternet (aka DucDuyGaming)

ONE LIGHT STAND
- Get a bronze medal while staying on lighthouse without leaving.

- Kill a zombie while using a Grenade Launcher with an Explosive Rounds upgrade to trigger explosion (with Oxygen Tank, Propane Tank, or Barrel Roll).

- Kill a Tank using only M60.

- Kill a Tank with Magnum.