Orpheus
From Halopedia, the Halo wiki
Orpheus is a Halo 3 Meta-Game Achievement. It is earned when the player earns 15,000 points while playing the meta-game on Cortana. This Achievement gives 10 Gamerpoints to the player.
It is represented by a blue circle with a fist and thunderbolts. It might also be considered one of the easiest achievements to get. Playing Cortana on Heroic with the Catch, Thunderstorm, Fog and Tough Luck Skulls will guarantee at least 20,000 points by the level's end, if the player doesn't die that often.
Trivia
The name Orpheus was ancient Greek; in Greece, Orpheus went into Hades to find his wife Eurydice and bring her back. In the Halo 3 level Cortana, the Master Chief (symbolizing Orpheus) goes into High Charity (symbolizing Hades, after it was infested by the Flood) to find Cortana (symbolizing Eurydice).
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