Seriously...

Killed 10,000 people in Versus matches

I Can See You!

Spotted 100 enemies ending in an assisted kill in Versus

Nub Pwn3r

Won 20 rounds in ring-based game types by shutting out the opposing team

Re-up

Reached Level 100 and re-upped

Clusterluck

Killed 3 enemies at once 10 different times

Handyman

Killed an enemy with every weapon in Versus

THIS! IS! ANNEX!

Completed 100 matches in ring-based game types and captured 3 objectives in each match

Don't You Die On Me

Revived 100 teammates in Versus multiplayer

Around the World

Won a match on every Versus map

Better Late Than Never

Won 25 matches in Team Deathmatch

Level 25

Reached level 25

Level 10

Reached level 10

Can't Touch Me

Won 10 Versus matches without losing a round

Level 5

Reached level 5

Don't Hate the Player

Finished with the highest points in a Versus match

Gimme Some Skin

Played one Versus Match with a Custom Weapon Skin

Always Remember Your First

Finished playing a Versus match

Zen and the Art of Reloading

Performed 25 perfect active reloads

Welcome to Delta Squad

Escaped from the Slab

Zen and the Art Part 2

Performed 5 perfect active reloads in a row

Prison Breakout

Completed tutorial path on any difficulty