Raise an Army for the Dreadscar Rift

Check your bags and bank for a Summoning Portal, as this item is warbound and may already be in your possession from a previous character.

Recruit troops using the BfA mission table — every troop recruited on any of your Warlocks counts toward the 20-troop total, since this achievement is warbound across all your Warlock characters.

If your character has completed Argus content, purchase Krokul Ridgestalker from the NPC in Krokuun for 150 Order Resources (900 for additional purchases each week), and Void-Purged Krokul from the NPC in Eredath — you can buy 7 of each type (using 2 purchases per type since they are Unique 5), giving you up to 7 recruits that skip the 30-minute wait time of normal recruits. You can also purchase Lightforged Bulwark from the NPC in the Vindicaar.

You cannot recruit new troops while you still have living ones, and troops cannot be manually dismissed, so send troops on missions featuring the Lethal hazard (green skull icon) without countering it, which reduces their vitality to zero and removes them so you can recruit replacements — using the Argus troops lets you cycle 7 at a time instead of 3, completing the achievement in approximately 5–6 logins.