The Eternal Cylinder

Onkifurts are flying creatures with large green sacs filled with poisonous gas. They attack by flying over a group of Trebhums, shooting upward into the air, and the slamming down, hurting any directly beneath it as well as releasing a cloud of harmful poisonous gas.

For this achievement, you'll need to locate a female Onkifurt sitting in her nest. If you cannot find one naturally, you can follow one out hunting around from a safe distance and they may eventually return to the nest.

Once the Onkifurt is stationary on the ground, sneaking up on it becomes much easier. Simply walk up to it -leaving enough distance to avoid alerting it, and use your water sac to squirt water into its open mouth (located, relatively speaking, on top of its head).