Dragon Age: The Veilguard

During the main quest, “The Singing Blade,” you'll enter some elven ruins in an attempt to retrieve Solas’ dagger. When there, during your first real battle, you'll learn the takedown ability.

Takedowns are effectively special moves you can perform with the button once you've filled an enemy's stagger gauge. Simply do this 5 times and the ‘Between a Room and a Hard Place’ achievement will unlock. 

Super easy, this one, as you’ll likely do hundreds before the credits roll.