Dil wrote This tells you a guide for the achievement and which challenges need doing.

ALL credit to Trueachievements member: JMJimmy

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This is the COMPLETE list of challenges required for this achievement - it has been graciously verified by the developer. Any challenges listed under a specific area are NOT part of this achievement. I'll continue to update how to unlock the various challenges but most are self explanatory.

BUG DETAILS: There is a bug in this achievement, if the JEEEEENKINSSSSSS!!! challenge (or possibly others) is the last one completed the achievement will sometimes fail to pop. If this is the case, simply complete any other challenge and this ought to cause it to re-check everything and poop the achievement.

Items marked in italics must be unlocked before they can be completed.

ENEMIES

Little Person, Big Pain - Kill 10 Midgets

Load and Lock - Kill 20 Loaders

Bully the Bullies - Kill 25 Bullymongs

Cruising for a Bruising - Kill 10 Bruisers

Marauder? I Hardly Know 'Er - Kill 20 Marauders

You Dirty Rat - Kill 10 Rats

Mama's Boys - Kill 50 Psychos

You (No)Mad, Bro? - Kill 10 Nomads

Short-Chained - Shoot a chain to release midgets from shield

Hurly Burly - Shoot 10 bullymong-tossed projectiles out of midair
(3 of these are required for a quest)

Just a Moment of Your Time... - Kill 10 surveyors

WHY SO MICH HIRT?! - Kill 10 goliaths

Paigineering - Kill 10 Hyperion personnel

Constructor Destructor - Kill 5 constructors

Another Bug Hunt - Kill 10 varkids
- Unlocked upon entering Tundra Express

Tentacle Obsession - Kill 10 threshers
- Unlocked upon entering The Highlands - Outwash

Pest Control - Kill 10 spiderants
- Unlocked upon entering Frostburn Canyon

Crystals Are a Girl's Best Friend - Kill 10 crystalisks
- Unlocked upon entering The Fridge

Pod Pew Pew - Kill 10 Varkid pods before they hatch
- Unlocked upon entering Tundra Express

Die in the Friendly Skies - Kill 10 buzzards
- Unlocked upon entering The Dust

You're One Ugly Mother... Kill 10 stalkers
- Unlocked upon entering The Highlands - Outwash

Skags to Riches - Kill 10 skags
- Unlocked upon entering Three Horns - Divide


ELEMENTAL
These can be done by any method including skills, grenades, weapons, or barrels.

Slag-Licked - Deal 5000 bonus damage to Slagged enemies

Boom. - Kill 20 enemies with explosive damage

Cowering Inferno - Ignite 25 enemies

Say 'Watt' Again - Deal 5000 electrocute damage

Corroderate - Deal 2500 corrosion damage

I Just Want to Set the World on Fire - Deal 5000 burn damage

Acid Trip - Kill 20 enemies with corrode damage
(it must be the corrosion that kills not the weapon/explosion damage)


LOOT

Open Pandora's Boxes - Open 50 lootable chests, lockers, and other objects

The Call of Booty - Open 5 treasure chests

Nothing Rymes with Orange - Loot or purchase 1 orange item

Purple Reign - Loot or purchase 2 purple items

I Like My Treasure Rare - Loot or purchase 5 blue items

It's Not Easy Looting Green - Loot or purchase 20 green items

Another Man's Treasure - Loot or purchase 50 white items

Gun Runner - Pick up or purchase 10 weapons


MONEY AND TRADING

Psst, Hey Buddy... - Trade with 1 other player

Whaddaya Buyin'? - Purchase 2 items with Eridium

Limited-Time Offer - Buy 1 "Item of the Day"

Wholesale - Sell 10 items to vending machines

For the Hoard! - Save $10,000

Dolla Dolla Bills, Y'all - Pickup $5,000 from cash drops


VEHICLE
All vehicle challenges unlock by entering a vehicle or turret. This includes the "Boom Bewn" gun in the first boss area.

Passive Aggressive - Kill 1 enemy while riding as a passenger
(not a gunner - requires a vehicle capable of carrying more than 2 people)

Turret Syndrome - Kill 10 enemies with a turret or vehicle mounted weapon

Blue Sparks - Kill 5 enemies while power sliding
(hold RB while driving)

Hit-and-Fun - Kill 5 enemies by ramming them with a vehicle

...One Van Leaves - Kill 5 vehicles while in a vehicle
(in any position in the car)


HEALTH AND RECOVERY

I'll Just Help Myself - Get 5 "Second Winds" by killing an enemy when fighting for your life

This Is No Time for Lazy! - Revive a co-op partner 5 times

Badass Bingo - Get 1 "Second Wind" by killing a badass enemy

Heal Plz - Heal 1000 points worth of damage
(any method)

Death, Wind, and Fire - Get 1 "Second Wind" by killing an enemy with burn damage over time
(must be the burn damage that kills)
- Unlocked by completing Cowering Inferno level 1

Green Meanie - Get 1 "Second Wind" by killing an enemy with corrosive damage over time
(must be the corrosive damage that kills)
- Unlocked by completing Acid Trip level 1

I'm Back! Shocked? - Get 1 "Second Wind" by killing an enemy by electrocution damage over time
(must be electric damage that kills)
- Unlocked by completing Say "Watt" Again level 1

GRENADES

Woah, Black Betty - Kill 10 enemies with Bouncing Betty grenades
(these come in various forms but will usually say "Rubber" in the name or indicate that it bounces)

Health Vampire - Kill 10 enemies with Transfusion grenades
(These will be indicated in the sub-text of a grenade saying it will "steal health" from an enemy)

Pull the Pin - Kill 10 enemies with grenades

Chemical Sprayer - Kill 10 enemies with "Area of Effect" grenades
(this includes electrical, fire, and gun grenades)

EXPLOOOOOSIONS! - Kill 10 enemies with Mirv grenades
(these are grenades that split into multiple parts)

Singled Out - Kill 10 enemies with Singularity grenades
(these are marked by "pulls enemies in" in the subtext)


SHIELDS

Ammo Eater - Absorb 20 ammo with an Absorption shield

Roid Rage - Kill 5 enemies while buffed by a "Maylay" shield
(most commonly contains the Roid keyword, shield must be at 0 to gain bonus)

Game of Thorns - Kill 5 enemies with reflected damage from a Spike shield
(shields that deal elemental damage to melee attackers but not via Nova)

Amp It Up - Kill 5 enemies while buffed by an Amplify shield
(Shield must be full to gain Amp bonus)

Super Novas - Kill 5 enemies with a Nova burst shield
(shields with the Nova keyword, once equipped let your shield be reduced to 0 and a sphere of damage explodes from your current position, must fully recharge shield after to "charge" the next Nova)


ROCKET LAUNCHER

Rocket and Roll - Kill 10 enemies with rocket launchers

Gone with the Second Wind - Get 2 "Second Winds" with rocket launchers

Sky Rockets in Flight... - Kill 25 enemies from long range with rocket launchers
- Unlocked by completing Gone with the Second Wind level 1

Shield Basher - Kill 5 shielded enemies with 1 rocket each
- Unlocked by completing Splish Splash level 1
(enemy must be full health for it to count)

Splish Splash - Kill 200 enemies with rocket launcher splash damage
- Unlocked by completing Rocket and Roll level 1

A method for this challenge is to go to Southern Shelf - Bay area. Clear out the cove, do the loop around the boats, clear out the cove again, then activate Midgemong. He'll call in reinforcements until he bugs out. This area is ideal for both challenges due to the fact that a) the enemies are respawned for you almost immediately b) the low level and number of enemies c) the fact that it's close quarters so there are lots of walls for splash damage and you don't need to chase enemies down. Unfortunately it does have one major downside - ammo. While there's an ammo dump available where Midgemong spawns, it doesn't sell rockets and the ammo boxes are too low level to spawn them either. So once you run out of ammo you need to trek back and forth to get more. One glitch that can be exploited is that once you reach 0/0 ammo on the rocket launcher chests have a much higher chance of spawning rocket launchers and rocket launcher ammo. I've not tested the chests in this area to see if they are high enough level, but that might be a way of getting more ammo.

Catech-a-Rocket - Kill 5 enemies with direct rocket hits
- Unlocked by completing level 5 of Splish Splash


SNIPER RIFLE

Longshot - Kill 20 enemies with sniper rifles

Longshot Headshot - Get 25 critical hits with sniper rifles

Leaf on the Second Wind - Get 2 "Second Winds" using sniper rifles

Eviscerated - Kill 5 shielded enemies with 1 sniper rifle shot
(must be full health and full shields for it to count)
- Unlocked by completing Longshot level 1

No Scope, No Problem - Kill 5 enemies without using zoom (ironsight)
- Unlocked by completing Longshot level 1

Snipe Hunting - Kill 10 enemies with critical hits using sniper rifles
- Unlocked by completing either Critical Acclaim level 1 or Longshot Headshot level 1 (not sure which as they both completed at the same time for me)

Surprise! - Kill 5 unaware enemies with sniper rifles
(must be a single shot kill when the enemy is not red on the mini-map)
- Unlocked by completing No Scope, No Problem level 1 *note there have been reports that this is not the full unlock requirements. When I unlocked this I had completed level 1 of all other Sniper Rifle challenges and it unlocked upon completing the last level 1 sniper rifle challenge (No Scope, No Problem)


ASSAULT RIFLE

Aggravated Assault - Kill 25 enemies with assault rifles

From My Cold, Dead Hands - Get 5 "Second Winds" using assault rifles

This is My Rifle... - Get 25 critical hits with assault rifles

...This is My Gun - Kill 10 enemies with critical hits using assault rifles
- Unlocked by completing This is My Rifle... level 1

Crouching Tiger, Hidden Assault Rifle - Kill 25 enemies with assault rifles while crouched
- Unlocked by completing Aggravated Assault level 1


SMG

Hail of Bullets - Kill 25 enemies with SMGs

Constructive Criticism - Get 25 critical hits with SMGs

High Rate of Ire - Kill 10 enemies with critical hits using SMGs

More Like Submachine FUN - Get 2 "Second Winds" with SMGs


SHOTGUN

Faceful of Buckshot - Get 50 critical hits with shotguns

Shotgun! - Kill 25 enemies with shotguns

Lock, Stock, and ... - Get 2 "Second Winds" with shotguns

Shotgun Surgeon - Kill 10 enemies with critical hits using shotguns

Open Wide! - Kill 750 enemies from point-blank range with shotguns

Fastest method for this challenge is to go to Southern Shelf - Bay area. Clear out the cove, do the loop around the boats, clear out the cove again, then activate Midgemong. He'll call in reinforcements until he bugs out. This area is ideal for this challenge due to the fact that a) the enemies are respawned for you almost immediately b) the low level and number of enemies c) the fact that it's close quarters so you don't need to chase enemies down

Shotgun Sniper - Kill 10 enemies from long range with shotguns
- Unlocked by completing level 5 of Open Wide!

PISTOL

Hard Boiled - Get 2 "Second Winds" with pistols

The Killer - Kill 25 enemies with pistols

Deadeye - Get 25 critical hits with pistols

Quickdraw - Kill 10 enemies shortly after entering ironsights
(LT - zoom then fire quickly)
- Unlocked by completing The Killer level 1

Pistolero - Kill 10 enemies with critical hits using pistols
- Unlocked by completing Deadeye level 1


MELEE

Fisticuffs! - Kill 25 enemies with melee attacks

A Squall of Violence - Kill 20 enemies with bladed guns
(guns will show a bayonet on the end)
- Unlocked by completing Fisticuffs! level 1


General Combat

Knee-Deep in Brass - Fire 1000 rounds

Afternoon Delight - Kill 50 enemies during the day

...To Pay the Bills - Kill 20 enemies while using your action skills

Critical Acclaim - Kill 20 enemies with critical hits

...I got to Boogie - Kill 10 enemies at night

Boomerbang - Kill 5 enemies with Tediore reloads
(ie, when reloading a Tediore brand gun it throws them like a grenade, the damage this causes must kill the enemy. Warning: any ammo in the clip will be lost)

Gun Slinger - Deal 5,000 damage with Tediore reloads
(same as Boomerbang)

Not Full of Monkeys - Kill 10 enemies with stationary barrels
(barrels launched from the vehicle do not count)


MISCELLANEOUS

JEEEEENKINSSSSSS!!! - Kill Jimmy Jenkins once
(Jimmy Jenkins is a randomly occurring loot monster, meaning he will jump out of boxes/crates/etc when you open them. Due to a probable bug he's usually located in 4 cardboard boxes during the main missions in the Animal Sanctuary. If you don't do this during the 2 main missions you can join someone else's game who has them active OR get it on your second playthrough... otherwise it'll be a lot of box grinding to find him)

Sidejacked - Complete 5 side missions

Compl33tionist - Complete 10 optional mission objectives
(these are objectives that appear in blue and have a small + symbol at the top right of the checkbox)

Haters Gonna Hate - Win 1 duel

Yo Dawg I Herd You Like Challenges - Complete 5 challenges
(These are the area specific challenges like finding Vault Symbols or killing a boss without taking damage, etc OR for completing level 5 of any challenge listed here. 2 level 5 challenges are required to be completed to unlock all level 1 challenges so only 3 challenges need to be completed. I recommend 'Cult of the Vault' in Windshear Waste [open the doors in claptrap's place and it's on the back wall], This Ain't My First Rodeo in Three Horns - Valley [stand on the edge of the steam vent and let it toss you up], and Vault Hunter on Wire in Shouthern Shelf - Bay [instead of calling the platform to get across drop down onto the chain and run across])

It revolves around every challenge that has a level I'm sure.


Good luck!