The Pipe Works Expansion Pack Add-on for Xotic has 4 achievements.
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)
Defeat a combat level using only the Scorch weapon (requires Pipe Works DLC)
Complete a Pipe Works level in Scab Attack mode