I hate games with sh*t achievements like Fable III. There is one for collecting all weapons - but wait you can't get them all in your save you have to trade on live. Srsly.
It also has other stupid achievements like: get married to someone on live, have a baby with someone on live and start a business with someone on live.
They obviously didn't learn from the 'doll collector' achievement from Fable II. On top of that the game sucks. Maybe if it was a stand-alone game it might have been better, but as Fable it failed miserably.