List compiled by FrustratedNerd
Currently there is 29 unobtainable achievements worth 420 gamerscore.
Note: This list does not include ‘hard to get’ achievements like the DLC map specific achievements for Halo 3, 4, and Reach. While they’re nearly impossible to get the way they were meant to be, friends can be found to help ‘boost’ these in an unintended way.
Halo: Spartan Assault (iOS) - 5 Total (40gs)
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Pension Plan (10gs): Earn 25000 XP throughout your career - Weapon Of Choice (5gs): Score a kill with every handheld weapon (excluding Rocket Launcher and Spartan Laser) - Skull Combo (10gs): Complete any mission with the maximum number of Skulls active - Extra Credit (10gs): Complete 75 mission specific challenges - A For Effort (5gs): Complete all Operation F mission challengesHalo: The Master Chief Collection (China) - 4 Total (90gs)
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Who Needs Them? (10gs): Halo 3: On The Ark, complete the level without entering a vehicle on Legendary. - Hero (20gs): Halo 2: Complete every level of the game on Heroic difficulty. - Legend (50gs): Complete all campaigns on Legendary difficulty. - Rock And Coil Hit Back (10gs): Halo 2A MP: In Anniversary matchmaking, earn a total of 100 Environmentalist medals.Halo Wars 2 - 1 Total (10gs) [FIXED] 4-27-17
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Two heads are better than none (10gs): Win a Skirmish match with a friend against only AI opponents (2 or more)Halo 2 (PC) - 19 Total (275gs)
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Decorated Solider (10gs): Get awarded at least 8 different medals in one non-team game - Air Traffic Control (10gs): Blow up the Banshee in flight while manned, with grenades or the rocket launcher - Skewer Stopper (20gs): Kill the sword carrier after they kill 5 or more times in a row with the sword - Running Riot (20gs): Kill 10 opponents in a row in the same game, without dying - Ninja (20gs): In a non-team game, kill 5 people by melee, from behind - Triple Kill (20gs): Kill 3 opponents within 4 seconds - Killtacular (20gs): Kill 4 opponents within 4 seconds - Double Kill (20gs): Kill 2 opponents within 4 seconds - Rainman (25gs): Play every available game variant, with at least 3 other players, to the end of each game - Violent Cartographer (25gs): Play every available default map and stay in each game until it’s over - Stick It (5gs): Stick an opponent with a plasma grenade and blow them up - Killing Spree (20gs): Kill 5 opponents in a row in the same game, without dying - Carjacking (5gs): Steal an occupied vehicle from an opponent and take it over - Vigilante (10gs): Stop a Killing Spree of another player - Roadkill (10gs): Run over, hit and kill an opponent with a vehicle - Assassin (10gs): Melee an opponent from behind - Counterpoint (5gs): Kill the sword carrier - Sniper Kill (10gs): Kill an opponent with the sniper rifle or the beam rifle - Bonecracker (10gs): Hit and kill an opponent with a melee attackHalo Reach - 1 Total (5gs)
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A Storage Solution (5gs): Using the File Browser upload a file to your File Share.