Perhaps make it so that achievements become available after one full playthrough to keep the immersion.
In my case at least I do not bother with achievements at the first playthrough.
Also, here are some I'd like to see if made possible.
Never there - Finish the game without getting killed by any enemy.
Out of luck - Get killed by any enemy in the game.
A bull in a China shop - Break (How many there are minus a little bit.) 50-150 Porcelain objects.
It's worth a try - Succesfully hit a Grunt's or Brute's head with any throwable object.
Keep the fire going - Collect all Lantern Oil in the game.
Fanboy/girl - Listen to all commentaries in commentary mode.
That's it for now.