Halo: Spartan Strike

The main issue I found with trying this achievement was ammo. Make sure to always have at least one weapon available to quickly take out Watchers. As soon as you see them go near a fallen Knight, kill them. Conserve ammo on Watchers and Crawlers with melees as they are one hit kills. To keep track of fallen Knights, every time they should drop a Teleport armor ability, which makes their location easy to find. If possible, kill Knights as close to the little rings you stand on as possible so you don't risk one getting revived off screen. I also find using the Shock Chain ability helps if you are being overwhelmed by enemies.

As long as you are diligent in killing every Watcher and keep track of your ammo and dead Knights, you should have this achievement within a few attempts.

The main issue I found with trying this achievement was Ammo. Make sure to always have at least one weapon available to quickly take out watchers. As soon as you see them go near a fallen Knight, kill them. Conserve ammo on watchers and crawlers with melees as they are one hit kills. To keep track of fallen Knights, every time they should drop a Teleport armor ability, which makes their location easy to find. If possible, kill Knights as close to the little rings you stand on as possible so you don't risk one getting revived off screen. I also find using the Shock Chain ability helps if you are being overwhelmed by enemies.

As long as you are diligent in killing every watcher and keep track of your ammo and dead Knights, you should have this achievement within a few attempts.