| Achievement | How to unlock
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- A Peek into the Future (10 points)
| - Watched Aftermath teaser.
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| - Won one match in Free For All, Team Deathmatch, and Domination.
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- Blood Brothers (50 points)
| - Completed all Campaign Chapters in Co-op.
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- Challenge Accepted (5 points)
| - Completed your first Declassified mission.
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- Death to Locust (10 points)
| - Killed with all classes of COG in Overrun or Survival.
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- Death to the COG (10 points)
| - Killed with all classes of Locust in Overrun.
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| - Completed all Campaign Chapters on at least Casual difficulty.
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| - Won one match on every map in Domination.
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| - Achieved level 50 a second time and chose to re-up for another tour.
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- Globe Trotter (10 points)
| - Won a match on every map in all Versus modes.
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| - Completed Downtown Halvo Bay.
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| - Completed all Campaign Chapters on at least Hardcore difficulty.
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- Jack of All Trades (10 points)
| - Won 10 matches of Overrun.
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- Let's Do This (50 points)
| - Achieved level 50 and chose to re-up for another tour of duty.
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| - Completed all Campaign Chapters on Insane difficulty.
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- Never Forgotten (10 points)
| - Recovered 10 COG Tags during the Campaign.
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- Never Give Up (10 points)
| - Completed at least 20 Declassified missions.
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| - Completed Halvo Bay Military Academy.
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| - Won one match on every map in Overrun.
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| - Played any section in 4 player Co-Op.
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| - Equipped your first Medal.
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- Quality Soldiering (50 points)
| - Completed all Declassified missions.
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- Ready for War (20 points)
| - Earned at least one Onyx medal.
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- Respect for the Fallen (20 points)
| - Recovered all 48 COG Tags during the Campaign.
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- Ribbon Master (10 points)
| - Earned 3 unique Ribbons in any section.
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| - Attained 50 Stars on at least Casual Difficulty.
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| - Won one match on every map in Free For All.
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- Seriously Judgmental (75 points)
| - Completed all Declassified Missions on Insane difficulty.
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- Shooting Star (20 points)
| - Attained 75 Stars on at least Normal Difficulty.
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| - Attained 100 Stars on at least Hardcore Difficulty.
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| - Completed all Campaign Chapters on at least Normal difficulty.
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| - Attained all Stars on Insane Difficulty.
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| - Completed wave 10 on all maps in Survival mode.
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| - Earned the Onyx "War Supporter" medal.
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- Take Back This City (10 points)
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| - Won 10 rounds of Team Deathmatch.
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| - Won one match on every map in Team Deathmatch.
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- The Aftermath (20 points)
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- The Real Thing (10 points)
| - Completed Seahorse Hills.
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- They Called Him Karn (10 points)
| - Completed Museum Of Military Glory.
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- This One's Not Over (10 points)
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| - Achieved level 50 a third time and chose to re-up for another tour.
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- Veteran Remembrance (10 points)
| - Recovered 25 COG Tags during the Campaign.
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