Veteran of the Molten Front

Prioritize unlocking the Druids of the Talon vendor in the Molten Front, as doing so puts you on the fastest path toward the time-gated achievement Death From Above, which requires multiple weeks minimum to complete.

Unlock all three vendors in the Firelands daily hub. Once all three are unlocked, you will receive a mail — follow the instructions and complete all quests from that mail to earn the Legacy of Leyara achievement.

For The Fiery Lords of Sethria's Roost, kill Kelbnar, Searris, Fah Jarrak, and Andrazor. Kelbnar is located at the top area near the mountains where Protectors of Hyjal takes place — use the general chat channel to coordinate spawn locations with other players.

You do not need the associated quest active to receive credit for Ready for Raiding II — go to the area and wait for another player to start the event, then tag the mob with your first hit to receive credit. Start working on this from the first day you have access to the Molten Front.

Accept the Call the Flock quest and transform into bird form, then abandon the quest and travel to the quest area to call only the Goldwing Hawks. Do not accept the follow-up quest until the Ludicrous Speed achievement is completed, as you can attempt this even after completing your daily flock.

Use _NPCScan to detect the rare NPCs required for the Have We Met? achievement as you complete your daily quests in the Molten Front.

Death From Above and Ready for Raiding II are the two achievements most likely to be completed last. Do not finish Fire in the Skies until you have completed the Death From Above achievement, so you can continue checking for the required elementals each day.