Halo Wars 2

This achievement will likely come naturally over the number of online matches you play during your time on Halo Wars 2, but it can be done rather quickly in a solo Skirmish match against the AI on Easy. If you prefer to knock this out quickly, head into the Skirmish lobby and make these setting changes:

• Gametype: Deathmatch
• Starting Supply: 9999
• Starting Power: 9999
• Fog of War: OFF

Now make sure to set the AI's difficulty to Easy and choose a Banished Leader. Take note that each Banished Leader has an exclusive Unit to build, so you will have to redo this twice more to build those additional Units at a later time.

When the match starts, begin building a few turrets and shields to act as a proper defense (just in case the enemy attacks you), and then construct and upgrade one Extractor and one Harvester for additional Supplies and Power. Next, upgrade your Stronghold (the main building) to a Citadel for 1,000 Power (this unlocks Tier 2 Units). Once that is done, upgrade the Citadel to a Fortress for another 1,500 Power (this unlocks Tier 3 Units).

You'll then want to construct one of each building: Apex, Foundry, Raid Camp, War Council. After these have been built, begin constructing one of each Unit from each. You can refer below for a quick checklist of what needs to be constructed for this achievement.

Apex

• Engineer
• Banshee
• Shroud
• Blisterback

Foundry

• Marauder
• Reaver
• Locust
• Wraith

Fortress

• Chopper (exclusive to Atriox & Decimus)
• Ghost (exclusive to Shipmaster)
• Grunt Squad

Raid Camp

• Jump Pack Brutes
• Suicide Grunts
• Elite Rangers
• Hunters

War Council

• Scarab
• Atriox's Chosen (exclusive to Atriox)
• Warlord (exclusive to Decimus)
• Honor Guard (exclusive to Shipmaster)

Once you have constructed all 19 Banished Units, this achievement will finally unlock.