boi gold, Battle of immortals Gold

The Twilight Zone requires your raid to kill Sartharion while all three Twilight Drakes are still alive. Considered one of the hardest fights in the game this achievement may take awhile to get while using a normal strategy. But keep your cool and keep trying and it will be yours. Or use the zerg method and make Battle of immortals Gold that much easier.
Twilight Assist and Twilight Duo (10 & 25) - Requires your raid to kill Sartharion with one or two drakes still alive. Most raids do no drakes or all three at once, which would give you all these achievements. If you absolutely feel that your raid needs to do only one or two drakes, use the same strategy used for three drakes misusing the drakes you have already killed as needed.