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Close the rift leaking void creatures in Icebind Cavern.

Chapter 4: Icebind Cavern has a portal that will spawn multiple enemies and then collapse once you've killed everything that pours out. To find this portal, you will first need the Void Bomb ability that you unlock toward the end of the chapter. Once you get this, backtrack to the starting area and forward to find a platform which indicate where the Void Bomb ability should be used. This will teleport you forward, and further on from where you get transported you'll be able to glide over a small gap to find the portal. The achievement will unlock as soon as it collapses.