You killed an enemy Scout Cavalry with your Town Center.
Won a game playing as the Cumans.
You destroyed a ship using a melee unit.
You built a Wonder.
You ate 2 Wild Boars in the Dark Age.
H3: ODST: Complete Kizingo Blvd.
H3: ODST: Find the 3rd clue unraveling the mystery.
H3: ODST: Complete Uplift Reserve.
H3: ODST: Complete any level without using Covenant weapons.
H3: ODST: Find the 2nd clue to unraveling the mystery.
H3: ODST: Complete Tayari Plaza.
H3: ODST: Earn a Triple Kill medal with the pistol on any level.
H3: ODST: I've got my eye on you, Marine.
H3: ODST: Find the 1st clue to unraveling the mystery.
Complete 50 missions or multiplayer games.
Halo 3: Complete every level of the game on Easy difficulty.
Halo 3: Complete Halo.
Halo 3: Complete every level of the game on Normal difficulty.
Collect 4,000 campaign or playlist medals.
Halo 3: Find and claim the Mythic Skull.
Halo 3: Complete Cortana.
Halo 3: Complete The Covenant.
Halo 3: Complete The Ark.
Halo 3: Activate Terminal 1 on The Ark.
Halo 3: Complete Floodgate.
Halo 3: Complete The Storm.
Halo 3: Complete Tsavo Highway.
Halo 3: Complete Crow's Nest.
Kill 5,000 enemies or players.
Halo 3: Complete Sierra 117.
Halo 3: Fight alongside and listen to The Man. The Legend. Chips Dubbo.
Halo 2: Complete The Great Journey.
Halo 2: Beat the par score on The Great Journey.
Halo 2: Complete every level of the game on Normal difficulty.
Halo 2: Complete every level of the game on Easy difficulty.
Halo 2: Activate Terminal 13 on The Great Journey.
Collect 3,000 campaign or playlist medals.
Halo 2: Complete High Charity.
Halo 2: Activate Terminal 12 on High Charity.
Halo 2: Collect the Rampant Cortana toy in High Charity.
Halo 2: Complete Uprising.
Halo 2: Activate Terminal 11 on Uprising.
Kill 100 Brutes.
Halo 2: Beat the par score on Gravemind.
Halo 2: Complete Gravemind.
Kill 50 Hunters.
Halo 2: Kill an enraged, berserk Brute using melee.
Halo 2: Beat the par score on Quarantine Zone.
Halo 2: Complete Quarantine Zone.
Kill 1000 Flood.