There was once a time, I remember it well, when achievements meant only personal victory. Defeated Ruby Weapon in FFVII? Yeah right, I don’t believe you. Made it to the real ending of Ghosts and Goblins? Bollocks you did. Got past the Hoover Dam level on Teenage Mutant Ninja Turtles? Why are you such a dirty liar?
But you would know and you could hopefully feel secure in the knowledge. Then again, what good is a gaming achievement if nobody believes you? No good is the true answer.