You’ll be introduced to the meat vortex early in the game. They are plants with vines that block a path or entrance to a cave.
For the vortexes you need to open to progress the story, the pufferbirds will be nearby. All you need to do is kick them toward the vortex and watch them get sucked in.
However, some vortexes are a little more off-path and hide collectibles. To get the achievement, you’ll need to ‘blend’ some pufferbirds in these too. For these ones pufferbirds may not be conveniently nearby. In this case, you can bring a pufferbird close to the vortex using bait then kick it as before. I found that if the vortex is a little far from the Pufferbirds it can take a little practice and a little patience to get the pufferbird to travel the distance to the bait. You can use multiple baits to get them to travel further distances, but they usually wont engage with your second bait if it is thrown too soon after the first.