Mission 5: Jacked 6 Covenant Vehicles.
Completed Mission 5 on any difficulty.
Won 100 Skirmish or Multiplayer Matches.
Got 20,000 points in any Skirmish Game.
Hot dropped 50 squads to your Covenant Leader in a single game on Barrens.
Got a Scarab during a Reinforcement game.
Gained at Least 15 population from a single wave in a Reinforcement game.
Killed 20 enemy squads with a continuous Covenant Leader Power on Memorial Basin.
Won 75 Skirmish or Multiplayer Matches.
Won 50 Skirmish or Multiplayer Matches.
Won 40 Skirmish or Multiplayer Matches.
Won 30 Skirmish or Multiplayer Matches
Disrupted 5 active Leader Powers in a single game on Blood River.
Won a 3v3 Skirmish game with 2 AI Allies.
Won a game on every Skirmish Map.
Won 20 Skirmish or Multiplayer Matches
Unlock 20 Timeline Events.
Won 10 Skirmish or Multiplayer Matches
Won a Skirmish Game with every Leader.
Won a game in every Skirmish Game Mode.
Won and never trailed in a Tug of War game.
Won and had the highest score in a Public Game.
Won a Public game.
Won a Skirmish Game with Dual Scarabs.
Used one of the 6 Major Leader Powers to destroy an enemy's last unit.
Completed Mission 4 on any difficulty.
Completed Mission 3 on any difficulty.
Collected your first Skull.
Mission 3: Killed at least 5 Covenant Units with the Bridge.
Won a Heroic Skirmish Game against the AI in under 10 minutes.
Got a winning High Score with 10 or less Squads against the Heroic AI.
Scored the winning point in a game of Keepaway against Legendary AI's.
Finished with 5000 net resources tributed to your teammates on Memorial Basin except in Deathmatch.
Unlocked a Timeline Event.
Completed Mission 2 on any difficulty.
Got a Gold Medal on any mission.
Completed Mission 1 on any difficulty.
Completed Mission 6 on any difficulty.
Improved your Score in any Campaign Mission.
Completed the Campaign on Legendary Difficulty.
Completed the Campaign on Heroic Difficulty.
Completed Mission 10 on any difficulty.
Completed Mission 7 on any difficulty.
Completed Mission 8 on any difficulty.
Completed Mission 9 on any difficulty.
Finished all missions under Par Time on Heroic difficulty.
Completed Mission 11 on any difficulty.
Completed Mission 12 on any difficulty.
Completed Mission 13 on any difficulty.
Completed Mission 14 on any difficulty.
Completed Mission 15 on any difficulty.
Finished one mission under Par Time on Heroic difficulty.
Mission 15: Opened the Doors in order.
Collected 8 Skulls.
Unlocked All Timeline Events.
Completed any Campaign Mission in Co-op Mode.
Mission 14: Didn't claim an extra base.
Mission 13: Destroyed 25 units with the Scarab.
Mission 12: Repaired the Power Core in less than 4 minutes.
Mission 11: Saved all the Airlocks.
Mission 10: Distrupted all Tractor Beams.
Mission 9: Every Colony put in Hibernation Mode at the same time.
Mission 8: Used Elephants to train 100 infantry.
100% Completion.
Got a Gold Medal with all Debuff Skulls Active.
Played Halo Wars for at least 24 Total hours.
Mission 7: Did not destroy any Power Node.
Mission 6: Successfully protected every Rhino.
Mission 4: Saved Adam.
Mission 2: Destroyed every Methane Tank.
Mission 1: Rammed 50 Grunts with Warthogs.
Obtained a lifetime campaign Score over 1,000,000.
Collected all Skulls.
Finished five missions under Par Time on Heroic difficulty.
Got a Gold Medal on every Campaign Mission.