Alright, let's jump right into this game, as I know you're DYING (no pun intended) to play.
Start up a New Game and play through the game. Simple as that. All the achievements in this game are Story related, so as long as you progress enough, solve the 'puzzles' and push through, you'll get all of the achievements.
There is no (current) reward for playing the game on the harder of the two difficulties, so unless you just want a challenge (more so because you won't be able to find anything unless you've already played it), just stick to the Easy mode.
All the 48 achievements in this game are story-related, and thus not missable.
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