Seriously ...
Kill 10,000 people in versus ranked match total
50 
THIS! IS! ANNEX!
Complete 100 multiplayer matches of 3+ rounds in Annex and capture 3 objectives in each match
40 
Completed Act 1 on Insane
Complete Act 1 on Insane Difficulty
30 
Completed Act 2 on Insane
Complete Act 2 on Insane Difficulty
30 
Completed Act 3 on Insane
Complete Act 3 on Insane Difficulty
30 
Completed Act 4 on Insane
Complete Act 4 on Insane Difficulty
30 
Completed Act 5 on Insane
Complete Act 5 on Insane Difficulty
30 
Commando
Complete all acts on Insane Difficulty
30 
For the Fallen
Recover all of the COG tags (on any difficulty)
30 
My Love for You Is Like a Truck
Defeat a Berserker on Hardcore Difficulty
30 
Broken Fingers
Defeat a Corpser on Hardcore Difficulty
30 
A Dish Best Served Cold
Defeat General RAAM on Hardcore Difficulty
30 
I Can't Quit You Dom
Complete all acts in co-op as Dominic Santiago on any difficulty
30 
Is It a Spider
Kill 100 enemies in ranked matches with grenade tag
30 
Around the World
Win a ranked match on every versus map
30 
Inconceivable!
Win 20 rounds of multiplayer matches in Annex by fewer than 5 points
30 
Nub Pwn3r
Win 20 rounds of multiplayer matches in Annex by shutting out the opposing team
30 
You Down With E.P.I.C?
Win a multiplayer match of 3+ rounds in any game type on 6 different downloadable maps
30 
Green Thumb
Win 20 multiplayer matches of 3+ rounds in any game type on the Garden multiplayer map
30 
Mind the Gap
Win 20 multiplayer matches of 3+ rounds in any game type on the Subway multiplayer map
30 
Purdy Mouth
Win 20 multiplayer matches of 3+ rounds in any game type on the Bullet Marsh multiplayer map
30 
All That Juice
Win 20 multiplayer matches of 3+ rounds in any game type on the Process multiplayer map
30 
Completed Act 3 on Hardcore
Complete Act 3 on Hardcore Difficulty
20 
Completed Act 4 on Hardcore
Complete Act 4 on Hardcore Difficulty
20 
Completed Act 5 on Hardcore
Complete Act 5 on Hardcore Difficulty
20 
Soldier
Complete all acts on Hardcore Difficulty
20 
Honor-Bound
Recover two-thirds of the COG tags (on any difficulty)
20 
Zen and the Art Part 2
Perform 5 perfect active reloads in a row (on any difficulty)
20 
Clusterluck
Kill 3 enemies at once 10 different times (on any difficulty)
20 
A Series of Tubes
Host and complete 50 ranked matches
20 
Domination
Complete 10 different co-op chapters as Dominic Santiago on any difficulty
20 
Fall Down Go Boom
Kill 100 enemies in ranked matches with the Boomshot
20 
Pistolero
Kill 100 enemies in ranked matches with a pistol
20 
The Nuge
Kill 100 enemies in ranked matches with the Torque Bow
20 
I Spy with My Little Eye
Kill 100 enemies in ranked matches with the Longshot
20 
Don't Hurt 'Em
Kill 100 enemies in ranked matches with the Hammer of Dawn
20 
Curb Appeal
Kill 100 enemies in ranked matches with the curb stomp
20 
Capital Punishment
Kill 100 enemies in ranked matches with an execution
20 
The Money Shot
Kill 100 enemies in ranked matches with a headshot
20 
Mix It Up
Win a ranked match in every versus game type
20 
Can't Touch Me
Win 10 ranked matches without losing a round
20 
Completed Act 1 on Hardcore
Complete Act 1 on Hardcore Difficulty
20 
Completed Act 2 on Hardcore
Complete Act 2 on Hardcore Difficulty
20 
Prison Breakout
Completed tutorial level on any skill level
10 
Completed Act 1 on Casual
Complete Act 1 on Casual Difficulty
10 
Time to Remember
Recover one-third of the COG tags (on any difficulty)
10 
Zen and the Art of Reloading
Perform 25 perfect active reloads (on any difficulty)
10 
Completed Act 2 on Casual
Complete Act 2 on Casual Difficulty
10 
Dom-curious
Complete 1 co-op chapter as Dominic Santiago on any difficulty
10 
Don't You Die On Me
Revive 100 teammates in ranked matches
10 
It's a Massacre
Kill 100 enemies in ranked matches with the Chainsaw
10 
Completed Act 3 on Casual
Complete Act 3 on Casual Difficulty
10 
Always Remember Your First
Finish playing a versus ranked match
10 
Don't Hate the Player
Finish with the highest points in a ranked match
10 
Completed Act 4 on Casual
Complete Act 4 on Casual Difficulty
10 
Completed Act 5 on Casual
Complete Act 5 on Casual Difficulty
10 
Mercenary
Complete all acts on Casual Difficulty
10