Currently, there are 38 underworld factions (more may come in the future)
*** Spoiler - click to reveal ***1. All-Seeing Eye
2. Amanithrax
3. City of Thieves
4. Court of Foxes
5. Crypt Keepers
6. Dark Court
7. Dark Pits
8. Depths of Sin
9. Dripping Caverns
10. Duergaroth
11. Eldrazhor
12. Emperinazar
13. Fang Moor
14. Fell Roost
15. Fire Rift
16. Frostfire Keep
17. Hall of Guardians
18. Hell Gate
19. Illithia
20. Indrajit's Palace
21. Lyrasza's Lair
22. Mirrored Halls
23. Nightmare Circus
24. Obsidian Depths
25. Primal Rift
26. Sea of Sorrow
27. Silver Necropolis
28. Stonesong Eyrie
29. Sunken Fleet
30. The Black Heart
31. The Deep Hive
32. The Labyrinth
33. The Warrens
34. Tinker Town
35. Umbral Nexus
36. Werewoods
37. Wild Court
38. Wyrmrun
You have to purchase each faction on your map (4000 gold each), then finish the faction's Quest before you can start its Delve and Hoard.
Delve as deep as you can in each faction with a custom team of your own first; then do the highest level you can with a full team of that faction's troops as you acquire them and upgrade them. Build your hoards to at least 100 for max points from hoards.
10000 divided by 38 = 263.15 per faction average renown. So it should be quite easy to get this achievement now.
Renown Points Breakdown for each Faction:Best Delve Defeated (max 500) X2 (max 1000)
Best Delve with no casualties (max 500) X1 (max 500)
Best Delve using the faction's team X1 (max 500)
Treasure Hoard level X5 (max 500) Total points possible per faction: 2500
Here are all the Renown-related achievements
With 38 factions in the game, the average renown to break these scores will be:
5000/38 = 131.57
10000/38 = 263.15
20000/38 = 526.31
30000/38 = 789.47
40000/38 = 1052.63
50000/38 = 1315.78
For help on scoring higher renown, consult the strategies for
The Exalted achievement in Gems of War worth 730 pointsReach the Highest Renown Possible in a Single Faction