Ok, I'm game. Did my best to focus primarily on epic or traditional doom, while still finding 25 to scrape together. I guess I need to check out the ones I don't know and make some discoveries instead of having 6 Saint Vitus albums in there.
1. Candlemass - Ancient Dreams
2. The House of Capricorn - In the Devil's Days
3. Saint Vitus - V
4. Pentagram - Last Rites
5. Candlemass - Nightfall
6. Pagan Altar - Pagan Altar (a.k.a. Volume 1 / Judgement of the Dead)
7. Northwinds - Winter
8. Pentagram - Be Forewarned
9. Saint Vitus - Born Too Late
10. Candlemass - Tales of Creation
11. Pagan Altar - The Room of Shadows
12. Electric Wizard - Come My Fanatics...
13. Northwinds - Chimeres
14. Saint Vitus - Die Healing
15. Candlemass - Epicus Doomicus Metallicus
16. Northwinds - Great God Pan
17. Electric Wizard - Electric Wizard
18. Saint Vitus - Mournful Cries
19. VVARP - First Levitations
20. Saint Vitus - Saint Vitus (1984)
21. Cathedral - Forest of Equilibrium
22. Pentagram - Show 'Em How
23. Pentagram - Curious Volume
24. Saint Vitus - Saint Vitus (2019)
25. Northwinds - Eternal Winter
HM: Solitude Aeturnus - Through the Darkest Hour
edit: had to acknowledge that I prefer Pentagram's Show 'Em How over Curious Volume now.