For those of you that don't know, the descriptoin of this guide states: "Completed level 1 of all non-level-specific challenges with a single character"
This means that when you open up your Bada** Rank screen, you will need to complete at least level 1 with each of those challenges (except for a few in which I will point out).

This might seem a little overwhelming, but if you have completed the game once, or even a couple times, you will notice that you have most of these nailed already.
Most of these challenges are quite easy, just very time consuming, so be patient. If you are farming any of these, remember that it is easier to go to a low level place and kill those enemies, rather than keep on going with the ones at your level.

Please note that some of the challenges are not unlocked untill you complete other ones, or get to a certain area.

Sidenote: this is more of a checklist, to help you see what you still need to get, and some of the challenges are hidden, so you can see what to do to get them un-hidden.

Please comment with any questions you have or suggestions, all is appreciated.
And if you want me to make a guide about anything, send me a PM or post on my profile.

Little Person, Big Pain
Kill 10 Midgets

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 mid-air

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 at: Tundra Express

Tentacle Obsession
Kill 10 Threshers
- Unlocked at: Highlands - Outwash

Pest Control
Kill 10 Spiderants
- Unlocked at: Frostburn Canyon

Crystals Are a Girl’s Best Friend
Kill 10 Crystalisks
- Unlocked at: The Fridge

Pod Pew Pew
Kill 10 Varkid pods before they hatch
- Unlocked at: Tundra Express

Die in the Friendly Skies
Kill 10 Buzzards
- Unlocked at: The Dust

You’re One Ugly Mother…
Kill 10 Stalkers
- Unlocked at: Highlands - Outwash

Skags to Riches
Kill 10 skags
- Unlocked at: Three Horns - Divide

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

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

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

Passive Aggressive
Kill 1 enemy while riding as a passenger

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

Blue Sparks
Kill 5 enemies while power sliding

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

…One Van Leaves
Kill 5 vehicles while in a vehicle

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

Death, Wind, and Fire
Get 1 “Second Wind” by killing an enemy with burn damage over time
- Unlocked at: Cowering Inferno level 1 (Elemental)

Green Meanie
Get 1 “Second Wind” by killing an enemy with corrosive damage over time
- Unlocked at: Acid Trip level 1 (Elemental)

I’m Back! Shocked?
Get 1 “Second Wind” by killing an enemy by electrocution damage over time
- Unlocked at: ay "Watt" Again level 1 (Elemental)

Woah, Black Betty
Kill 10 enemies with Bouncing Betty grenades

Health Vampire
Kill 10 enemies with Transfusion grenades

Pull the Pin
Kill 10 enemies with grenades

Chemical Sprayer
Kill 10 enemies with “Area of Effect” grenades

EXPLOOOOOSIONS!
Kill 10 enemies with Mirv grenades

Singled Out
Kill 10 enemies with Singularity grenades

Ammo Eater
Absorb 20 ammo with an Absorption shield

Roid Rage
Kill 5 enemies while buffed by a “Maylay” shield

Game of Thorns
Kill 5 enemies with reflected damage from a Spike shield

Amp It Up
Kill 5 enemies while buffed by an Amplify shield

Super Novas
Kill 5 enemies with a Nova burst shield

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 at: Gone With The Second Wind Level 1

Splish Splash
Kill 200 enemies with rocket launcher splash damage
- Unlocked at: Rocket And Roll level 1

Shield Basher
Kill 5 shielded enemies with 1 rocket each
- Unlocked at: Splish Splash level 1

Catech-a-Rocket
Kill 5 enemies with direct rocket hits
- Unlocked at: Splish Splash level 5

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
- Unlocked at: Longshot level 1

No Scope, No Problem
Kill 5 enemies without using zoom
- Unlocked at: Longshot level 1

Snipe Hunting
Kill 10 enemies with critical hits using sniper rifles
- Unlocked at: Longshot Headshot level 1

Surprise!
Kill 5 unaware enemies with sniper rifles
- Unlocked at: No Scope, No Problem level 1

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 at: This Is My Rifle... level 1

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

Hail of Bullets
Kill 25 enemies with SMGs

Constructive Criticism
Get 25 critical hits with SMGs

More Like Submachine FUN
Get 2 “Second Winds” with SMGs
- Unlocked at: Constructive Criticism level 1

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

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
- Note: This one needs to be unlocked all the way

Shotgun Sniper
Kill 10 enemies from long range with shotguns
- Unlocket at: Open Wide! level 5 (Yup, thats 750... CRAZY)

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
- Unlocket at: The Killer level 1

Pistolero
Kill 10 enemies with critical hits using pistols
- Unlocket at: Deadeye level 1

Fisticuffs!
Kill 25 enemies with melee attacks

A Squall of Violence
Kill 20 enemies with bladed guns
- Unlocket at: Fisticuffs! level 1

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

Gun Slinger
Deal 5,000 damage with Tediore reloads

Not Full of Monkeys
Kill 10 enemies with stationary barrels

JEEEEENKINSSSSSS!!!
Kill Jimmy Jenkins once

Sidejacked
Complete 5 side missions

Compl33tionist
Complete 10 optional mission objectives

Haters Gonna Hate
Win 1 duel

Yo Dawg I Herd You Like Challenges
Complete 5 challenges