Cult of the Lamb

To get this achievement you must complete several steps revolving around Sozo. First are the initial quests for Sozo if you just started the playing the game for the first time (meeting him for the first time in the second dungeon, bring him 10 mushrooms in spore gortto, bring him 20 mushrooms for the brainwashing ritual and performing said ritual, then building the mushroom statue in your cult) after some time has passed travel back to spore grotto and you'll find him dead.

Now for the actually achievement itself, go to his corpse and pick the mysterious seed and plant that somewhere in your cult (put it in your garden in a empty hole and water it). after sometime has pass you can then pluck out the mushroom and Sozo will stay in your as a follower he won't do anything except run around. He'll then give you a mission to give him 5 mushrooms (this is where I screwed up and said no to him) give him the mushrooms. Then he'll give you another mission to go back to the second dungeon area to find a mushroom follower you must decline his mission and he'll be angry and become a Dissenter. Throw him in prison and re-educate him. After re-educating him he'll revert back to his old self Dr. Sozonious, after some dialogue the achievement will pop.

And for those who are like me and screw up like me don't worry what will happen is that he'll give you the mission for the mushroom follower do it and complete it, then after some time he'll kill the mushroom follower and after more time he'll ask you again for a mushroom follower which then you can reject his mission and then throw him in prison and re-educate him and the achievement will unlock once Dr. Sozonious finishes his dialogue