Group Dungeons are dungeons that are built for 4 players so if you enter these alone, you won't even gonna make it pass the first wave of enemies.
Your group should consist of 1 healer, 2 damage dealers and 1 tank but some dungeons doesn't require a tank.
Having a healer is essential for survival so make sure you have one in your group.
Clearing veteran version of these dungeon do not count toward this achievement.
There are 5 group dungeons in each faction, 1 in each zone. The Aldmeri Dominion dungeons are the following:
- The Banished Cells
- Elden Hollow
- City of Ash
- Tempest Island
- Selene's Web
To get this achievement, you have to get 5 in game achievements that belong to each dungeon. Each achievement requires your group to kill certain bosses in that dungeon, you can check your progress in the in game achievement menu.
- Vanquisher of the Banished Cells: Defeat Shadowrend and High Kinlord Rilis in the Banished Cells.
- Elden Hollow Vanquisher: Defeat Akash gra-Mal, Chokethorn, and Canonreeve Oraneth in Elden Hollow.
- City of Ash Vanquisher: Defeat the Infernal Guardian, the Warden of the Shrine, and Razor Master Erthas in the City of Ash.
- Tempest Island Vanquisher: Defeat Valaran Stormcaller, Stormfist, and Admiral Neidir.
- Selene's Web Vanquisher: Defeat Longclaw, Foulhide, and Selene in Selene's Web.
The bosses that are required for the achievements are always in your main path so they are impossible to miss.
All of these are relatively easy except Selene's Web. During the Longclaw fight, have your tank pull the tiger spirits while the rest attacks the boss and healer heals the tank.
For Selene's fight, have the tank pull the spider in the corner of the cave and just mash her to death ignoring the adds if you can.