This achievement is simply for walking into the same trap twice and dying. An easy spot to do this is near the start of the game in Act 1. You will have a brief underwater swim as part of the story progression and you will find yourself in the scene you see below in the screenshot. When you come up out of the water, simply walk onto the platform trap that is circled on the lower right. It will snap shut and crush you, killing you. You will instantly respawn just to the left of it, where you see me standing. Jump back over to the right and stand in the center of the trap to get crushed to death again.
Achievement unlocked! :)