There are "impossible" Achievements, like making it out of Mass Effect 2 on Insanity with all crew mates alive and kicking, and then there are genuinely impossible Achievements, their Gamerscore riches put beyond mortal hands by some quirk of technology.
I WILL FIND A WAY!
But mostly for myself.
All of them (860G)
Servers getting turned off is a common thing. But with Chromehounds, a whopping 860G are no longer available. Listen. Listen to that whopping sound. That's Chromehounds, literally whopping.
good luck my brother. lemme know how this goes. :)
Then there was another trophy for unlocking all the weapons in multiplayer that glitches for a lot of people. And that was after they patched a problem that prevented you from getting unlock credits so you could actually unlock the weapons.
Funny that for a studio that could accomplish what they did with graphics, they couldn't get the achievements right.