The Warp Field Expansion Pack Add-on for Xotic has 4 achievements.
Destroy a child of a Megabrain before it hits the ground (requires Warp Field DLC)
Turned the Scab meter purple (chain of 25) at least 10 distinct times in a level (requires Warp Field DLC)
Complete all 3 goals in a non-tutorial level before killing a single enemy (requires Warp Field DLC)
Finish a Warp Field level in Brain Attack mode