Must be done with 2 controllers.
The earliest opportunity you will have to obtain this achievement is on level 37 of the ‘Garden Party’ levels. The method here will require a little bit of speed as you only have 10 seconds as the achievement description states. Have both characters pick up both the pick axe and the hammer and position them either side of the sculpting block. You are going to need to alternate holding
on both characters until the sculpture is complete. You may need to practice the sculpting once or twice so that you are familiar with it, but it’s not too difficult to take in.