THIS IS STORY RELATED AND CANT BE MISSED
Since the achievements description doesn't specify it (and I was really worried that id miss this achievement while I was playing the game) I thought id just let you all breathe easy knowing that just progressing through the story will result in this Achievement.
No matter what dialogue choice you choose you can't fail the game, that's the beauty of this game. Of course your choices will change important outcomes throughout the whole story such as who lives/dies as well as whether the characters like or hate you. There are also sections in the game where you move Clem to interact with items but for the most part its an awesome story where you choose the dialogue and the ending (to an extent).
So once again take a big breath and know you will not miss this achievement as long as you play through the game.