This is a list of Halo 3 Achievements. It was found when hacking into the coding of the Halo 3 Beta, and therefore, may not reflect the achievements of the finished product of Halo 3.
List of Achievements
Mission Completion
achievement_complete_mission_jungle
achievement_complete_mission_base
achievement_complete_mission_outskirts
achievement_complete_mission_voi
achievement_complete_mission_floodvoi
achievement_complete_mission_wasteland
achievement_complete_mission_citadel
achievement_complete_mission_highcharity
achievement_complete_mission_halo
Campaign Completion
achievement_complete_campaign_easy
achievement_complete_campaign_normal
achievement_complete_campaign_heroic
achievement_complete_campaign_legendary
Skull Finding
achievement_find_jungle_skull
achievement_find_base_skull
achievement_find_outskirts_skull
achievement_find_voi_skull
achievement_find_floodvoi_skull
achievement_find_waste_skull
achievement_find_citadel_skull
achievement_find_highcharity_skull
achievement_find_halo_skull
Multiplayer
achievement_banshee_surface_to_air_kill
achievement_triple_kill
achievement_killtacular
achievement_sticky_x5
achievement_brokeback
achievement_tripmine_vehicle_kill
achievement_flag_carrier_kill
achievement_kill_frenzy
achievement_triple_sword_kill
achievement_mongoose_splatter
achievement_melee_kill_x5
achievement_needler_kill_x5
achievement_sniper_kill_frenzy
achievement_headshot_kill_frenzy
achievement_full_warthog_kill
Other
achievement_jungle_training
achievement_jungle_no_casualties
achievement_floodvoi_no_flood_victims
achievement_spartan_recruit
achievement_spartan_graduate
achievement_spartan_officer
achievement_extra_crispy
Placeholder
achievement_temporary_placeholder