Here is the full list of all 13 Bad Rats: the Rats' Revenge achievements. It takes around 5-6 hours to unlock all of the achievements on Windows.
Completed five maps using less objects than planned
Solved ten maps with less than one minute
Thirty maps solved
Solved twenty maps
Solved ten maps
Solved five maps with less than one minute
Uou! Solved fifteen maps in less than one minute.
Forty maps solved
Completed all levels
Completed two maps using one single object.
Finished ten maps using less objects than the plan
OHH! Fifteen maps completed using less objects than planned
Finished 10 maps in the first try