Doom 3 BFG Edition guide will show you how to unlock the all of us achievement/trophy.
In Doom 3 BFG Edition guide will help you locate the ID logo which is located in the secret room. Once you locate the Secret room you will find teh ID logo in that room and you will be able to unlock the All of us achievement and trophy in the game and will honor you with the ID Logo Secret room in Doom 3. Once you unlock this you will be one step closer to completing the game through the entire mission of the game and help you with the other parts of it to you. Follow the complete Doom 3 BFG Edition ID logo secret room guide to help you unlock this achievement and trophy.