Once again, the list below comes courtesy of Exophase. As per usual, potential spoilers lie ahead.
A Peek into the Future - Watched Aftermath teaser
All Rounder - Won one match in Free For All, Team Deathmatch, and Domination
Blood Brothers - Completed all Campaign Chapters in Co-op
Challenge Accepted - Completed your first Declassified mission
Death to Locust - Killed with all classes of COG in Overrun or Survival
Death to the COG - Killed with all classes of Locust in Overrun
Determined - Completed all Campaign Chapters on at least Casual difficulty
Dominator - Won one match on every map in Domination
Fearless - Achieved level 50 a second time and chose to re-up for another tour
Friends - Completed Aftermath
Globe Trotter - Won a match on every map in all Versus modes
I Told You - Completed Downtown Halvo Bay
Iron Fist - Completed all Campaign Chapters on at least Hardcore difficulty
Jack of All Trades - Won 10 matches of Overrun
Let's Do This - Achieved level 50 and chose to re-up for another tour of duty
Level 5 - Reached level 5
Level 10 - Reached level 10
Level 20 - Reached level 20
Level 30 - Reached level 30
Level 40 - Reached level 40
Level 50 - Reached level 50
Lion Heart- Completed all Campaign Chapters on Insane difficulty
Never Forgotten - Recovered 10 COG Tags during the Campaign
Never Give Up - Completed at least 20 Declassified missions
Open Arms - Completed Halvo Bay Military Academy
Overran - Won one match on every map in Overrun
Party People - Played any section in 4 player Co-Op
Proud Wearer - Equipped your first Medal
Quality Soldiering - Completed all Declassified missions
Ready for War - Earned at least one Onyx medal
Respect for the Fallen - Recovered all 48 COG Tags during the Campaign
Ribbon Master - Earned 3 unique Ribbons in any section
Rising Star - Attained 50 Stars on at least Casual Difficulty
Roaming Free - Won one match on every map in Free For All
Seriously Judgmental - Completed all Declassified Missions on Insane difficulty
Shooting Star - Attained 75 Stars on at least Normal Difficulty
Star Struck - Attained 100 Stars on at least Hardcore Difficulty
Superstar - Attained all Stars on Insane Difficulty
Survivor - Completed wave 10 on all maps in Survival mode
Steel Nerves - Completed all Campaign Chapters on at least Normal difficulty
Sybarite - Earned the Onyx "War Supporter" medal
Take Back This City - Completed Onyx Point
Team Leader - Won 10 rounds of Team Deathmatch
Team On Tour - Won one match on every map in Team Deathmatch
The Aftermath - Unlocked Aftermath
The Real Thing - Completed Seahorse Hills
They Called Him Karn - Completed Museum Of Military Glory
This One's Not Over - Completed Courthouse
Unstoppable - Achieved level 50 a third time and chose to re-up for another tour
Veteran Remembrance - Recovered 25 COG Tags during the Campaign
Gears of War: Judgement is out Mar. 16 on Xbox 360.
