As Operation: Hunter goes on, I have made a complete list of all achievements for the legacy Halo games that require Xbox Live. This not only keeps them in one definitive list, but also shows if certain achievements need to be done on certain DLC maps.
Halo 3:
Any Map:
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Graduate - UNSC Spartan - Spartan Officer - Two for One - Triple Kill - Overkill - Lee R Wilson Memorial - Killing Frenzy - Steppin’ Razor - Mongoose Mowdown - Up Close and Personal - MVP - Maybe Next Time Buddy - Vidmaster Challenge: Annual - Vidmaster Challenge: 7 on 7 - Vidmaster Challenge: Lightswitch - Vidmaster Challenge: BrainpanMythic Map (Assembly, Orbital, Sandbox, Longshore, Heretic, Citadel)
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Ghost Patrol (Longshore) - Blades of Fury (Heretic) - Pull! (Citadel) - Hammer Time (Assembly) - Post Mortem (Orbital) - Get the Horns - Awww, Too Bad - Killtacular - Have Fun Respawning - Save This Film - Delicious Brains - Zombie Repeller - Tank DropperLegendary Map (Avalanche, Blackout, Ghost Town)
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Road Rage - Flag Dropped - Alas, Poor Yorick - Double Double - Look Both Ways - Defend This - Came… From… BehindHalo 3: ODST:
Any Map: -
Vidmaster Challenge: Classic - Vidmaster Challenge: Déjà Vu - Vidmaster Challenge: EndureHalo: Reach:
Any Map: -
Knife to a Gun Fight - Be My Wingman, Anytime - Yes, Sensei - Skunked - What’s a Killing Spree? - A Storage Solution - Cool File, Bro - Both Barrels - Cross-Mappin’ - Offensive Driver - Poppin’ & Lockin’ - Totally Worth It - You Ate All the Chips - You Blew It Up! - Return to Sender - Crackin’ Skulls - Candy from a BabyDefiant Maps (Condemned, Highlands, Unearthed)
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All Alone - Don’t Touch That! - Paper Beats RockAnniversary Maps (Battle Canyon, Penance, High Noon, Ridgeline, Solitary, Breakneck)
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Top Shot - Emergency Room - Stick It to the Man! - Dive Bomber - Licence to Kill - Bounty Hunter - From Hell’s HeartHalo 4:
Any Map: -
I <3 Red vs Blue - Hanging on the Combat Deck - The Challenged - The Challenger - Armorer - Badge - PWND - What a Poser! - The Cartographer - Game Changer - Snapshot! - The Director - Sharing is CaringCrimson Maps (Harvest, Shatter, Wreckage)
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Now They Fly? - Size Is Everything - ODST - Bigfoot - David and Goliath - Clay Pigeon - Special Delivery - Pump Yer BrakesMajestic Maps (Landfall, Monolith, Skyline)
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Callin’ in the Big Guns - I Thrust at Thee - Didn’t See It Comin’ - Bird of Prey - Bullet Sponge - I See You! - Clever Girl - Flash of Light - Last Man Grinning - Pigs Can FlyCastle Maps (Daybreak, Outcast, Perdition)
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What is Yours is Also Mine - Dodge This! - Hello Nurse! - That Won’t Save You - Ashes to Ashes - Beating Up the Beat - Sight Seeing - Scrapyard - Outta My Way!Bullseye Maps (Pitfall, Vertigo)
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Protect This House - Hat Trick - From Downtown - Repeat Survivor - Can’t Catch Me - Just a Scratch - Pitchin’ a Tent - One Man Army - Shocking (Vertigo) - Got It! (Pitfall)Good luck Hunters!