Here is the full list of all 14 Operator Overload achievements.
Beat all the levels in Bonus 1.
Beat all the levels in World 2.
Complete the tutorial.
Beat all the levels in World 3.
Beat all the levels in World 4.
Beat all the levels in World 5.
Beat all the levels in World 6.
Create your own level.
Complete a level using less than the provided number of magnets.
Beat all the levels in every world.
Beat all the levels in Bonus 2.
Beat all the levels in Bonus 3.
Beat all the levels in Bonus 4.
Successfully upload a level to the Steam Workshop.