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 Daggerfall Covenant dungeons are the following:
- SpindleClutch
- Wayrest Sewers
- Crypt of Hearts
- Volenfell
- Blackheart Haven
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.
- SpindleClutch Vanquisher: Defeat the Swarm Mother and the Whisperer in Spindleclutch.
- Wayrest Sewers Vanquisher: Defeat Investigator Garron, Varain Pellingare and Allene Pellingare.
- Crypt of Hearts Vanquisher: Defeat Archmaster Siniel, the Bone Leviathan, and the Ilambris Twins.
- Volenfell Vanquisher: Defeat Quintus Verres, Tremorscale, and the Guardian's Constructs in Volenfell.
- Blackheart Haven Vanquisher: Defeat Atarus, the Roost Mother, and Captain Blackheart in Blackheart Haven.
The bosses that are required for the achievements are always in your main path so they are impossible to miss.
Personally I thought these are the hardest compare to the other factions' dungeons but with a good healer then all of these shouldn't be hard at all.