Challenge Warlords: Silver - Guild Edition

Challenge Warlords: Silver - Guild Edition is a guild dungeons & raids achievement earned by completing every Warlords of Draenor Challenge Mode dungeon with a rating of Silver or better while in a guild group.

Series

 * 1) Challenge Warlords - Guild Edition
 * 2) Challenge Warlords: Bronze - Guild Edition
 * 3) Challenge Warlords: Silver - Guild Edition
 * 4) Challenge Warlords: Gold - Guild Edition