Guild raid achievements can be earned in World of Warcraft by bringing a group of guildies to a raid and defeating the end boss of the raid. But just how many guild members are required in order to earn these raid achievements? Here's a quick reference guide for how many guildies you'll need!
Classic WoW Raids
Ruins of Ahn'Qiraj: This is now a 10-man level 60 raid, and will require 8 guild members to earn the guild achievement.
Molten Core, Blackwing Lair, Temple of Ahn'Qiraj: These 40-man level 60 raids require 10 guild members present to earn the respective guild achievements.
Burning Crusade Raids
All level 70 TBC raids, both 10 and 25-man, require 8 guildies present for the guild achievements.
Wrath of the Lich King Raids
10-man level 80 Wrath of the Lich King raids need 8 guildies, while 25-man raids need 20 guildies to earn the guild achievement.
Level 85 Cataclysm raids also require 8 for a 10-man, and 20 for a 25-man to receive guild achievement credit.