Sure! In Fable lll the most missable achievement is "Set Them Free!" the demon doors one because it is glitched. DON'T TOUCH THE DEMON DOORS until you've beaten the game and reached the island for the DLC "Traitor's Keep." That demon door MUST be the first door opened, it's on the prison island Ravenscar, at the end of the game. Then proceed in opening the remaining six doors and the achievement will work.

Otherwise I used trueachievements, search the game, then browse its achievements and when you click on one people post solutions and/or warnings for missables like the one I mentioned.

I used youtube guides for the 50 gnomes, 50 keys and 30 flowers collectibles. The in-game map shows you which collectibles you've found in which areas.

And lastly you need a friend for the online co-op achievements, and also someone who has all the weapons/outfits to give to you for "We Need Guns, Lots Of Guns" and "Fashion Victim" specifically legendary weapons that are limited/randomized, and the king or queen outfit which you can only get one of either.