My question really wasn't sarcastic. Are you saying that content is unavailable to people with less achievements? I'm asking a serious question here, I had a hard time understanding what you wrote.
I just don't get why a trophy would be a deciding factor for buying a game, I would imagine being able to play through the game with a friend would trump any need to collect trophies.
My bad if i misunderstood the purpose of your question and sorry for my bad English( is no my first language). The addition of trophies/achievements in games was a bad idea IMO. As others said some gamers buy games/DLC's/maps just for the achievements/trophies . Some after reach all of them forgot completely about the game.