Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Cat Out of Water	Drain all of the water in the Aqueducts.
Cool it	Fix the malfunctioning Heater Core.
Danger Cat	Finish the game without collecting a single health upgrade.
Fresh Air	Clean up the Ventilation System.
Moustache Forever! (secret)	It will live on in our memory.
Purrrrfectionist	Finish the game with 100% completion rate.
Rats!	Defeat a squeaky foe.
Rebba's BFF	Obtain the Hopper from Rebba.
Rebba's Little Helper	Obtain the Repeater from Rebba.
Save the Animals	Finish the game.
Sequence Break (secret)	Finish the Heater Core before acquiring the Spin Jump.
Speedrun	Finish the game in under 1 hour.