Shadow of Egypt: Achievement STEAM of Assassin's Creed Origins

There are plenty of opportunities for this throughout the story. There are also lots of enemy camps / restricted areas that house tons of enemies.
You do stealth kills bs sneaking up to someone from behind and pressing or by looking at them from an elevated position and pressing to do a jump execution. You can also use the predator bow for stealth kills. All that matters is that you stay undetected.