Halo Infinite

When you are at the main menu's Play tab select the fourth option down for Custom Game. You can change any settings if you like or just press Play at the bottom, (which should be already highlighted), to launch the game. When the game loads you can easily press the Menu button and choose the sixth option down, (the last option), to end the game. Once the results screen appears the achievement will unlock.

From the Play menu, go to the fourth option 'Custom Game'. Behemoth V1.0 (Arena: Stronghold) should appear as default. Select 'Mode Editor' and then 'Match' - set the 'Score to Win' as 80 which is the lowest option available. Then select 'Play'.

You'll be the only one in the map by default assuming you've not chosen any bots. After capturing a base in addition to the one you start out in (since you have to capture and control two or more zones), and sitting on it until 80 seconds has passed the match will end and the achievement will unlock.

To get this Achievement you must play 1 Custom Game.

Custom Games can be found at the bottom of the main menu & once there select it & choose play.