| Achievement | How to unlock
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- A history of decimation (10 points)
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- A little bit extra (10 points)
| - Complete half of the Campaign bonus objectives.
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| - Complete all the Campaign bonus objectives.
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- A strong showing for the week (10 points)
| - Complete a set of 3 Weekly Challenges in one week.
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- Alas, poor Yorick! (10 points)
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- All or nothing (10 points)
| - Play all cards in your deck at least once in a single Blitz match.
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- All travel is suspended (10 points)
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- And the knockout punch (10 points)
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| - Complete the Blitz tutorial.
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- Behind enemy lines (10 points)
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| - Spend 100 Leader Points in Multiplayer or Skirmish.
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| - Complete 25 Blitz matches (Matchmaking only).
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- Collecting a dream (30 points)
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- Comrades in arms (20 points)
| - Earn a gold medal on any mission (except Prologue) in Co-op on Legendary.
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| - Win your first Blitz match (Matchmaking only).
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- Fifth floor: Tools, Guns, Super Weapons (10 points)
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| - Beat wave 10 in Blitz Firefight.
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| - Complete a Multiplayer match (Matchmaking only).
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| - Destroy 100 air units with anti-air units (Multiplayer, Skirmish or Blitz).
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| - Complete Blitz matches as each of the 6 launch leaders (Matchmaking only).
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| - Earn a gold medal on any mission (except Prologue) on any difficulty.
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- Guerilla tactics (10 points)
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- It just keeps going (30 points)
| - Beat wave 25 in Blitz Firefight.
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| - Play 777 total Blitz cards over any number of matches.
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- Know the ropes (10 points)
| - Complete the Advanced standalone tutorial.
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- Last stop, this town (10 points)
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- Learn the ropes (10 points)
| - Complete the Basic standalone tutorial.
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| - Complete any mission (except The Signal) solo on Legendary with all skulls activated.
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- Long-term commitment (30 points)
| - Complete at least 1 Weekly Challenge each week for a month.
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- Making the most of the day (10 points)
| - Complete 3 Daily Challenges in one day.
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| - Kill 100 infantry with anti-infantry units (Multiplayer, Skirmish or Blitz).
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- Morbid curiosities (20 points)
| - Collect half of the Skulls.
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- Natural intelligence (10 points)
| - Play a Skirmish match alone against only AI opponents (1 or more).
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| - Score 500,000 points in a single Blitz Firefight.
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| - Destroy 500 units with Leader Powers (Multiplayer, Skirmish or Blitz).
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| - Achieve the highest possible kill-streak in any Blitz mode.
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- Palmer's Pure Gold (30 points)
| - Earn a gold medal on every mission (except Prologue) on any difficulty.
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- Sentinel size matters (10 points)
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- Short-term commitment (20 points)
| - Complete at least 1 Daily Challenge each day for a week.
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| - Cast 100 Healing Leader Powers (Multiplayer, Skirmish or Blitz).
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| - Spend 5 Leader Points in Multiplayer or Skirmish.
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- Stacked the chips (10 points)
| - Gather 150 Energy Crates over any number of Blitz matches.
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- Stirring the pot (10 points)
| - Complete The Cartographer.
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- Surviving the long war (60 points)
| - Complete the Campaign on Legendary.
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- The Scrappy Six (20 points)
| - Complete a Multiplayer match as each of the 6 launch leaders (Matchmaking only).
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- The hand that feeds (20 points)
| - Kill a unit owned by a developer or someone who has this achievement.
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- The hard fight (40 points)
| - Complete the Campaign on Heroic.
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- The rank and file (10 points)
| - Recruit or construct 1 of each UNSC unit in Multiplayer or Skirmish (Launch units only).
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| - Recruit or construct 1 of each Banished unit in Multiplayer or Skirmish (Launch units only).
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- This war is over (30 points)
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- Trash compactor (20 points)
| - Destroy 100 vehicles with anti-vehicle units (Multiplayer, Skirmish or Blitz).
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- Two heads are better than none (10 points)
| - Win a Skirmish match with a friend against only AI opponents (2 or more).
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- Two heads are better than one (10 points)
| - Complete a mission in co-op.
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- You've got a case of the Birley (20 points)
| - In a 1v1 Skirmish against Legendary AI, recycle your base in the first 5 minutes and then win.
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