This trophy is for completing the final quest of the Blackdagger Ruins adventure zone (lvl 20-25). This questline starts in the Protector's Enclave and leads into Blackdagger Ruins.
The quests are as follows:
- Trouble at the Broken Crown (PE-BR)
- Hunting for a Harper
- Lights on the Rocks
- Salvaging Order
- Savaging Salvagers
- The Sea Cave
- Seeking Goldseeker
- The Lost Caravan
- The Hidden Mine
- The Harper's Watch
- Grimstone Keep
There are some optional quests in between, but these are the required ones. Once you collect your reward from the chest at the end of "Grimstone Keep" the trophy will unlock.