Here is the full list of all 46 Xotic achievements.
The base game contains 34 achievements, and there are 3 DLC packs containing 12 achievements.
Defeat a combat level using only the Scorch weapon (requires Pipe Works DLC)
Perform a perfect chain with a point multiplier powerup active (requires Pipe Works DLC)
Complete a non-tutorial combat level with at least 95% accuracy (requires Pipe Works DLC)
Complete a Pipe Works level in Scab Attack mode
Finish a combat level without destroying a single Scab plant (requires Temple Crypt DLC)
Destroy multiple Orb Brains with 1 shot of the Slayer (requires Temple Crypt DLC)
Finish a combat level in Essence Attack mode without firing a single shot (requires Temple Crypt DLC)
Finish a Temple Crypt level in Essence Attack mode
Turned the Scab meter purple (chain of 25) at least 10 distinct times in a level (requires Warp Field DLC)
Destroy a child of a Megabrain before it hits the ground (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