Borderlands 2 mission flow

Windshear Waste
Follow Claptrap through Windshear Waste to achieve your first mission.
 * My First Gun
 * Blindsided

Southern Shelf

 * Cleaning Up the Berg
 * Best Minion Ever

Three Horns Divide

 * The Road to Sanctuary

Sanctuary

 * Plan B
 * Hunting the Firehawk
 * A Dam Fine Rescue
 * A Train to Catch
 * Raising Action
 * Bright Lights, Flying City
 * Wildlife Preservation
 * The Once and Future Slab
 * The Man Who Would Be Jack
 * Where Angels Fear to Tread
 * Where Angels Fear to Tread Part 2
 * Toil and Trouble
 * Data Mining
 * The Talon of God

Arid Nexus - Badlands

 * Hungry Like the Skag
 * Uncle Teddy

Arid Nexus - Boneyard

 * Get to Know Jack
 * This Just In

Bloodshot Stronghold

 * Out of Body Experience
 * Splinter Group
 * Assassinate the Assassins

Caustic Caverns

 * Minecart Mischief
 * Perfectly Peaceful
 * The Lost Treasure

The Dust

 * The Good, the Bad, and the Mordecai
 * Clan War: Starting the War
 * Clan War: First Place
 * Clan War: Reach the Dead Drop
 * Clan War: End of the Rainbow
 * Clan War: Trailer Trashing
 * Clan War: Wakey Wakey
 * Clan War: Zafords vs. Hodunks
 * Too Close For Missiles
 * Rakkaholics Anonymous
 * Monster Mash
 * Positive Self Image

Eridium Blight

 * A Real Boy: Clothes Make the Man
 * A Real Boy: Face Time
 * A Real Boy: Human
 * Customer Service
 * Kill Yourself
 * To Grandmother's House We Go

The Fridge

 * Note for Self-Person
 * Swallowed Whole
 * The Cold Shoulder

Frostburn Canyon

 * Cult Following: Eternal Flame
 * Cult Following: False Idols
 * Cult Following: Lighting the Match
 * Cult Following: The Enkindling

Fink's Slaughter House

 * Bandit Slaughter: Round 1
 * Bandit Slaughter: Round 2
 * Bandit Slaughter: Round 3
 * Bandit Slaughter: Round 4
 * Bandit Slaughter: Round 5

The Highlands

 * Best Mothers Day Ever
 * The Overlooked: Shields Up
 * The Overlooked: Medicine Man
 * The Overlooked: This is Only a Test
 * Slap Happy
 * Stalker of Stalkers
 * Hidden Journals
 * Arms Dealing
 * Hyperion Contract

Lynchwood

 * 3:10 to Kaboom
 * Breaking the Bank
 * Animal Rescue: Medicine
 * Animal Rescue: Food
 * Animal Rescue: Shelter
 * Showdown
 * Demon Hunter

Opportunity

 * Home Movies
 * Written by the Victor
 * Statuesque

Ore Chasm

 * Hyperion Slaughter: Round 1
 * Hyperion Slaughter: Round 2
 * Hyperion Slaughter: Round 3
 * Hyperion Slaughter: Round 4
 * Hyperion Slaughter: Round 5

Sanctuary Hole

 * Safe and Sound

Sanctuary

 * Claptrap's Secret Stash
 * Rock, Paper, Genocide: Fire Weapons!
 * Rock, Paper, Genocide: Shock Weapons!
 * Rock, Paper, Genocide: Corrosive Weapons!
 * Rock, Paper, Genocide: Slag Weapons!
 * Claptrap's Birthday Bash
 * Won't Get Fooled Again
 * Torture Chairs
 * The Bane
 * BFFs
 * The Chosen One
 * Do No Harm
 * Hell Hath No Fury
 * You. Will. Die. (Seriously.)
 * Bearer of Bad News

Sawtooth Cauldron

 * The Great Escape
 * Capture the Flags
 * The Lost Treasure

Southern Shelf

 * This Town Ain't Big Enough
 * Shielded Favors
 * Bad Hair Day
 * Handsome Jack Here!

Southern Shelf - Bay

 * Symbiosis

Thousand Cuts

 * Shoot this Guy in the Face
 * Defend Slab Tower
 * Rocko's Modern Strife
 * Poetic License

Three Horns - Divide

 * In Memoriam
 * The Name Game

Three Horns - Valley

 * Medical Mystery
 * Medical Mystery: XCOM-Municate
 * Neither Rain Nor Sleet Nor Skags
 * No Vacancy

Tundra Express

 * Mighty Morphin'
 * You Are Cordially Invited: Party Peep
 * You Are Cordially Invited: RSVP
 * You Are Cordially Invited: Tea Party
 * The Pretty Good Train Robbery
 * Mine, All Mine
 * No Hard Feelings

Wildlife Exploitation Preserve

 * Animal Rights
 * Doctor's Orders

Mission number
This section may be used to refer to missions friends are playing on Xbox Live. For example, 2-13 would mean True Vault Hunter Mode, mission 13 (The Once and Future Slab).

Story Missions

 * 1) My First Gun
 * 2) Blind Sided
 * 3) Cleaning Up the Berg
 * 4) Best Minion Ever
 * 5) The Road to Sanctuary
 * 6) Plan B
 * 7) Hunting the Firehawk
 * 8) A Dam Fine Rescue
 * 9) A Train to Catch
 * 10) Raising Action
 * 11) Bright Lights, Flying City
 * 12) Wildlife Preservation
 * 13) The Once And Future Slab
 * 14) The Man Who Would Be Jack
 * 15) Where the Angels Fear to Tread
 * 16) Where the Angels Fear to Tread Part 2
 * 17) Toil and Trouble
 * 18) Data Mining
 * 19) The Talon of God