PixelJunk Eden
32 Achievements
21-25h
PS3
Encore: 3 on 1
Kill three different types of enemy in a single jump. Available stages: Garden 11 - 15
3.4%
How to unlock the Encore: 3 on 1 achievement in PixelJunk Eden - Definitive Guide
You need to kill any three distinct enemies in a single jump. This includes any you kill while swinging before you jump. Garden 11 is the simplest choice.
Thanks to XxDarkDiazxX for this video. While it wasn't uploaded for 3 on 1 per se, he does randomly get the trophy while doing the stage. Just watch from 4:20 to 4:35 to see it in action.