So me and a buddy were in the middle of a Firestorm Citadel run and our conversation eventually led to the achievements, and how we wish OOO would make some more for us to hunt. I thought it'd be funny to post them here and see what other players thought of them. Some of them are aimed towards PvP only, or PvE or even just gear related. I won't be putting them in different sections though, I'm too lazy for that :P

All Your Gear Are Belong To Us [Or, alternatively, A Millionaire's Quest] - Obtain all the craftable gear in the game.
Hammer Time - Score more than 20,000 damage in Lockdown using only the Warmaster Rocket Hammer.
A Polar Light In The Sky! - Be in a team where everyone uses the Polaris during the whole game.
Most Effective Alchemer Switching - Score more than 10,000 damage in Lockdown using only Alchemer handguns.
Punching Bag - Get 3 Unique Variants on any piece of gear by using Punch's services.
The Clone Wars - Be in a Lockdown match where every player is using only Wolver line gear.
Rage Quit!!! - Make the opposing team quit before the time runs out.
The Hurt Locker - Make everyone angry by using only a Nitronome.
Taste the Rainbow! - Use the charges of all the Brandish line swords (Including the Cautery Sword).
A Dead Man's Switch - Kill someone while you're dead.
Still Alive - Be the only one surviving a big get-together.
pwnd!!1!11!! - Kill someone using only Proto gear in Tier 3 Lockdown.
Stunningly Shocking! - Team up with another bomber and make at least one enemy player suffer from the Stun and Shock statuses at the same time.
Got your back! - Prevent the death of a team-mate by having him be protected by your shield while s/he has less than 25% health.
Clean Up On Aisle 3... - Kill Lord Vanaduke with only 1 party member alive, and under 15% health.
Like a Ninja - As a Recon, kill two enemies that are trying to take your point.
The Boogie Monster - Harass only one player using the Recon Cloak during the whole match.
I Own You! - Stage a rigged match that gets you above 100,000 damage.
The Healthiest Of Them All - As a Guardian, use the Ancient set and two Penta-Heart Trinkets.
I Need No Stinking Medics! - Heal yourself from 10% or less health to 100% using only your Guardian Shield.
Vampiric Tendencies - Heal yourself from 10% or less health to 100% using only hearts dropped from enemy players.
U Jelly? - Acquire the Royal Jelly and Ice Queen sets.
Did That Hurt? - Kill someone using only one swing/shot/explosion.
Lightning Quick! - Acquire the Mercurial and Mercurial Demo sets.
Denied! - Keep interrupting attacks from a Striker by using your gun.
Speed Limit - Stun a Striker.
*Awkward Moment* - Attack someone in Tier 3 Lockdown using a Proto Bomb.
Expert Beginner - Get all 0 star gear and/or their equivalent upgrades.
Overkill To The Max! - Deal more than 10,000 damage total using a single explosion.
Under Contract - Kill every member of the opposite team in one match.
Knock Knock... Who's There... Sudaruska! - Kill someone using a Sudaruska while wearing a Plate set.
A Smashing Hit - Kill someone with the charge attack of a Troika line sword.
Backstabber! - Kill a frozen enemy by attacking his back.
Not So Fast! - Kill someone using a Cutter line sword with Maximum Attack Speed Increase.
This Game Sucks! - Keep someone pinned down using a Vortex bomb.
You mis... - Dash away from a killing attack, only to land in spikes.
Swiss Cheese - Kill someone with only an Autogun line handgun.
Mind: Blown - Stun someone from the opposing team with the Callahan charge.
Not Mainstream - In Lockdown kill someone with a Rigadoon/Flamberge instead of a Final Flourish.
Superman - Deal more than 20,000 damage and don't get hit during the whole match.
Kitty Lover - Upon finding a Mewkat, leave it alive (if it's not preventing the next wave of enemies) and finish the level.
Hot dog - Kill any kind of Gunpuppy with the Fire status.
Purrfect Run - Survive a Stratum without getting hit while wearing any Kat Helm.
Completely Mad! - Clear a Stratum 6 level wearing the Mad Bomber set with Nitronome, Big Angry Bomb, Irontech Destroyer and Heavy Deconstructor Bombs.
Sacrificing Love - Kill a Love Puppy because it prevents the next wave spawn.
Are You Feeling Okay? - Use any loadout with only Haze bombs as your weapons.
You Can't Touch Me-ow! - Dash through a Grimalkin so you receive no damage.
Nice 'n' Crispy - Die because of the Fire status.
Double Kill - Kill two enemy players with one attack.
First Blood - Be the first to kill in a round of Lockdown.
The Terror Of All Gremlins - Clear a Stratum 6 Deconstruction Zone with only Shadow weapons.
Bombastic! - Kill all bosses using only bombs.
I Want A Jelly Sandwich - Clear the Royal Jelly Palace with the Deadly Virulisk Set.
If You Seek Me... - Avert an attack with your Recon Cloak.
Juice Maker - Bring an Acheron with Maximum Charge Time Reduction to the Royal Jelly battle.
Practitioner Of The Dark Arts - Bring a Dark Retribution with Maximum Charge Time Reduction to the Royal Jelly battle and finish said battle in less than 30 seconds.
Fight Fire With Fire! - Use a Volcanic Pepperbox to finish Lord Vanaduke off.
That Dark Ritual!! - Beat Margrel in the Moorcroft Manor.
Give Me A Chance! - Use only the Warmaster Rocket Hammer to kill the Snarbolax.
WHAT A HORRIBLE NIGHT TO HAVE A CURSE. - Get cursed by your Gran Faust while using the Fallen set.
The Cake Is A Lie! - Get a Prismatic Frosted Helm.
The Secret Within - Acquire and open an Iron or Mirrored Lockbox.
Fiendish Retaliation - Clear a Fiend level with the Valkyrie set.
The Light At The End Of The Tunnel - Get to the Sanctuary.
Lost In The Unknown - Suffer a party wipe during the Unknown Passage.
Revenge Is A Dish Best Served Cold - Kill a Trojan using a Troika line charge attack.
Bookworm - acquire 1000 Ancient Page Tokens.
Such Big Teeth You Have! - Acquire 100 Frumious Fangs.
Swimming in Jelly - Acquire 100 Jelly Gems.
Toy Puppies! - Acquire 100 Bark Modules.
Memories Of Past Times - Acquire 100 Almirian Seals.
Fracture Of Fractures - Acquire 50 Fractured Seerus Mask Fragments.
Heavy Pockets - Get 1,000,000 crowns.
Ph.D in Mechanics - Beat the Roarmulus Twins in less than 2 minutes.
Love At First Sight - /kiss someone not on your Friend or Guild member lists, and that someone /kisses you back without saying anything else first.
Trolling Trojan's Tragic - Observe one Trojan killing another Trojan with its attack.
Firefox - Burn down every Wolver in a Wolver Den using Ash of Agni.
Firewall - Clear a Stratum 6 Fire themed Deconstruction Zone using only Ash of Agni.
Gladiator - Acquire all the craftable Swords in the game.
What Gun Control? - Acquire all the craftable Handguns in the game.
No Problems Here - Acquire all the craftable Bombs in the game.
Hat Simulator (Kind Of) - Get all the craftable Helms in the game.
Clothes For All Occasions! - Acquire all the craftable Armours in the game.
Nothing Is Getting Past Me! - Acquire all the craftable Shields in the game.
Cauterize Those Wounds! - Catch and die by a fire attack while you're low on health.
Kamikaze!! - Take an enemy player down using a charge attack that also kills you.
Curse You, Curse! - Use a Remedy Capsule to heal Curse.
Almirian Revenge - Kill Lord Vanaduke while wearing the Almirian Crusader set and Crest of Almire shield.
Poked To Death - Kill someone with the last stab of a Flourish/Snarble line sword.
Most Judicious Use Of A Pokey - Kill a Jelly using only a Flourish/Snarble line sword.
I'm Tired... - Use Sleep Vials to put a full wave of enemies to sleep.
Decapitation - Have the most de-caps in a round of Lockdown.
Hammering It In! - Kill a Beast or a Gremlin with the Warmaster Rocket Hammer.
Der Hammer! - Acquire the Warmaster Rocket Hammer.
A Trip, And A Death - Die by stepping onto a deployed spike trap.
Darwin Award - Run straight into a death trap and die after getting off the elevator.
Thick Skin - Have your health bar to become gold coloured.
Whaaaaaaat?!?!? - Destroy a wheel coming at you using a drop of water.
Drowned - Kill an enemy with a drop of water.
Gotta Catch 'em All! - Take a Sprite (from Firestorm Citadel) with you down the elevator.
A Hitchhiker's Guide To The Arcade - Do an Arcade run with a party and deal less then 5% of the total damage.
Die Hard! - Do an entire Firestorm Citadel run with no Heart trinkets and without picking up a Vitapod.
Combustible... NOT! - Do a Firestorm Citadel run while having Maximum Fire Penalty.
Feel The Burn - Using any gear with High or more penalty to Fire, survive the status by only using Health Pills and Hearts dropped by enemies.
Choke On The Splinters - Do a complete Shadow Lair Gloaming Wild Woods run using only Dark Briar Barrage.
That's Not Gonna Happen! - Kill a Trojan that was frozen as soon as it spawned, before it unfreezes.
The... Worst... Possible... Thing! - Get stunned and frozen by a Silversap.
Frostbite - Get bitten and frozen by a Frostifur, Alpha Frostifur or Perma-Frostifur.
Sniper'd - Get killed by a spike from any type of Lichen's Spin Attack while standing more than 5 tiles away from it.
Epic Fail - Win a round of Lockdown with the opposing team not getting any points.
Aw, Come On! - Have a party wipe during Lord Vanaduke's battle during the seconds it takes for him to die.
Wipped and Wiped - Have more than one party wipe in a run.
Braindead - Have any type of Zombie jump onto, grab, and eat you to death.
All Automatically Arranged Alliterations Are Abysmally Academic And Are Additionally Aesthetically Arousing - Play all levels whose names are alliterations and unlock all Achievements that are alliterations (except this one).
The Aimed And The Aimless - Clear the full clip of an Antigua line handgun in battle without hitting anything
The Awesome Button! - Walk up and down on the same button more than 10 times in a row.
Fkuc It! - Set a horde of Oilers or Toxoils on fire using your own fire weapon.
Hard Earned Loot - Kill a Rock Jelly that spawned from a stone block.
You're A Good Friend - Drop a Pill of yours so a team-mate can take and use it themselves.
Why Did I Even Bother? - Use a Remedy Capsule to get rid of a status, only to get the same status again shortly after.
In Your Face! - Get through a Mask phase at Lord Vanaduke using only one drop of water.
Whatever - Kill off Lord Vanaduke using only swords.
Necromancy - Keep a Zombie alive using by carrying a Grim Totem.
Not Good Enough... - Die due to your last hit from a 3-hit combo not killing your enemy.
Incooooooooooming! - Die due to a Zombie Jumping on you.

That's what we came up with till he had to leave. I know OOO won't probably bother putting more achievements for now but I did this thread for eeps and giggles :3