No missable achievements (plus 126 unknown)
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Found a Campaign log
Completed The Signal
Completed A New Enemy
Spent 5 Leader Points in Multiplayer or Skirmish
Collected a Skull
Completed Ascension
Completed the Basic standalone tutorial
Completed One Three Zero
Completed The Cartographer
Played a Skirmish match alone against only AI opponents (1 or more)
Earned a gold medal on any mission (except Prologue) on any difficulty
Completed Lights Out
Collected half of the Campaign logs
Completed a Multiplayer match (Matchmaking only)
Completed From the Deep
Completed the Advanced standalone tutorial
Completed Hold the Line
Completed Under the Dark
Killed a unit owned by a developer or someone who has this achievement
Completed The Foundry
Completed The Halo
Completed the Blitz tutorial
Completed Last Stand
Completed the Campaign
Spent 100 Leader Points in Multiplayer or Skirmish
Collected half of the Skulls
Played all cards in your deck at least once in a single Blitz match
Destroyed 100 air units with anti-air units (Multiplayer, Skirmish or Blitz)
Won a Skirmish match with a friend against only AI opponents (2 or more)
Built 10 Grizzlies (Multiplayer, Skirmish or Blitz)
Completed a mission in co-op
Destroyed 100 vehicles with anti-vehicle units (Multiplayer, Skirmish or Blitz)
Destroyed 500 units with Leader Powers (Multiplayer, Skirmish or Blitz)
Won 3 matches as Forge (Multiplayer, Skirmish or Blitz)
Beat wave 10 in Blitz Firefight
Killed 100 infantry with anti-infantry units (Multiplayer, Skirmish or Blitz)
Recruited or constructed 1 of each UNSC unit in Multiplayer or Skirmish (Launch units only)
Won your first Blitz match (Matchmaking only)
Casted 100 Healing Leader Powers (Multiplayer, Skirmish or Blitz)
Achieved the highest possible kill-streak in any Blitz mode
Killed 50 units with Forge's Warthog (Multiplayer, Skirmish or Blitz)
Completed 3 Daily Challenges in one day
Gathered 150 Energy Crates in Blitz matches
Completed half of the Campaign bonus objectives
Recruited or constructed 1 of each Banished unit in Multiplayer or Skirmish (Launch units only)
Killed 25 units with Jerome's Command Mantis unit. (Multiplayer, Skirmish, or Blitz)
Scored 500,000 points in a single Blitz Firefight
Completed 'What Could Go Wrong?' on any difficulty
Froze 50 squads with Cryo Abilities (Multiplayer, Skirmish or Blitz)
Completed Operation: Spearbreaker on any difficulty
Painted units using Pavium or Orbital Designator 30 times (Multiplayer, Skirmish, or Blitz)
Won 3 matches as Commander Jerome (Multiplayer, Skirmish, or Blitz)
Completed 'Fighting Retreat' on any difficulty
Won 3 matches as Colony (Multiplayer, Skirmish or Blitz)
Finished wave 10 (Terminus Firefight)
Completed 'Light the Fuse' on any difficulty
Won 3 matches as Sgt. Johnson (Multiplayer, Skirmish or Blitz)
Got a player score of 500,000 (Terminus Firefight)
Finished wave 20 (Terminus Firefight)
Got a player score of 1,000,000 (Terminus Firefight)
Completed a Multiplayer match as each of the 6 launch leaders (Matchmaking only)
Completed a set of 3 Weekly Challenges in one week
Completed 'The Archive' on any difficulty
Completed 'Manifestation' on any difficulty
Completed the 'Awakening the Nightmare' campaign on any difficulty
Activated the Grunt Goblin charge 10 times. (Multiplayer, Skirmish or Blitz)
Got a team score of 2,000,000 (Terminus Firefight)
Killed 50 units with Mega Turrets (Multiplayer, Skirmish, or Blitz)
Finished wave 30 (Terminus Firefight)
Beat wave 25 in Blitz Firefight
Won 3 matches as Morgan Kinsano (Multiplayer, Skirmish or Blitz)
Used Repair Beacon special ability 15 times. (Multiplayer, Skirmish or Blitz)
Got a team score of 5,000,000 (Terminus Firefight)
Won 3 matches as The Arbiter (Multiplayer, Skirmish or Blitz)
Won 3 matches as Yapyap (Multiplayer, Skirmish or Blitz)
Won 3 matches as Serina (Multiplayer, Skirmish or Blitz)
Completed wave 20 in co-op as a UNSC/Banished partnership (Terminus Firefight)
Trapped 100 units with Stasis (Multiplayer, Skirmish, or Blitz)
Won 3 matches as Pavium (Multiplayer, Skirmish or Blitz)
Shattered 20 squads that have been frozen (Multiplayer, Skirmish or Blitz)
Attached 50 skitterers to units (Multiplayer, Skirmish or Blitz)
Completed at least 1 Weekly Challenge each week for a month
Played 777 total Blitz cards
Completed the Campaign on Heroic
Completed 25 Blitz matches (Matchmaking only)
Fired 15 methane shells from the Methane Wagon. (Multiplayer, Skirmish or Blitz)
Completed 'Manifestation' without the Proto-Gravemind exceeding 50% critical mass
Won 3 matches as Voridus (Multiplayer, Skirmish or Blitz)
Built and held a minibase on every slot of a map at the same time (Terminus Firefight)
Built 50 barricades in a single game (Terminus Firefight)
Completed Blitz matches as each of the 6 launch leaders (Matchmaking only)
Collected all the Skulls
Earned a gold medal on any mission (except Prologue) in Co-op on Legendary
Completed the Campaign on Legendary
Killed 100 units with Inferno (Multiplayer, Skirmish or Blitz)
Used the Hunter Captain's Taunt ability 50 times (Multiplayer, Skirmish or Blitz)
Collected all the Campaign logs
Killed 50 units with Cataclysm (Multiplayer, Skirmish, or Blitz)
Built 50 turrets in a single game (Terminus Firefight)
Completed Operation: Spearbreaker on Heroic difficulty
Destroyed 20 bonus drops in a single game (Terminus Firefight)
Completed at least 1 Daily Challenge each day for a week
Burned 50 infantry with Kinsano's Flamewall ability (Multiplayer, Skirmish or Blitz)
Had a wall built on every plot of the map at the same time (Terminus Firefight)
Hijacked 40 vehicles with Omega Team members (Multiplayer, Skirmish, or Blitz)
Killed 20 air units with the Arbiter while raging (Multiplayer, Skirmish, or Blitz)
Prevented the Terminus from taking any damage for 15 waves (Terminus Firefight)
Completed Operation: Spearbreaker on Legendary difficulty
Won a 1v1 Skirmish against Legendary AI after recycling your base in the first 5 minutes
Gained a gold medal and completed all objectives in ‘Fighting Retreat’
Completed the 'Awakening the Nightmare' campaign on Heroic or higher
Finished wave 5 without training additional units (Terminus Firefight)
Used Invigorating Frenzy 50 times
Navigated the laser defenses in The Archive without losing any units on Heroic or above.
Completed any mission (except The Signal) solo on Legendary with all skulls activated
Earned a gold medal on every mission (except Prologue) on any difficulty
Gained a gold medal and completed all objectives in ‘What Could Go Wrong?’
Completed the 'Awakening the Nightmare' campaign on Legendary
Completed all the Campaign bonus objectives
Collected every Phoenix Log collectable in 'Awakening the Nightmare'
Killed 50 infantry units with the Colossus' Stomp ability (Multiplayer, Skirmish or Blitz)
Located the Sentinel defenses in The Archive using only the starting units.
Gained a gold medal and complete all objectives in ‘Light the Fuse’
Gained a gold medal and completed all objectives in ‘Not On My Watch’ on legendary
Beaten any level on legendary in par time with a scoring skull active (AtN only)
Gained a gold medal and completed all objectives in ‘Gatecrashers’ on legendary