The Witness and its "Challenge" achievement is cool. :-)

A Story About My Uncle and "Complete -level name- without failing" achievements :)

Star 69 in Call of Duty: Modern Warfare 2. Probably the hardest achievement I've ever got. On PC of course, it's a lot easier on consoles.

Thanks for the giveaway!
A diffeicult to get achievement? Uhm... I'm not really caring to get them - I just enjoy playing.

PAYDAY 2 has some very difficult achievements

Thanks!