As of today (September 23rd), http://www.trueachievements.com/game.aspx?gameid=3549
will be offering double XP in all game modes, to all players, on all maps. In the name of keeping it simple, there are basically no restrictions in place, just the chance to get some boosting partners together and harvest the score whilst the getting is good.
Here's the official statement:
Starting this Friday, 23rd September at 12pm (BST) and running up until Monday, 26th at 11am (BST), Crysis 2 will be dishing out ANOTHER double-XP weekend, this time for all platforms! After our recent releases of CryENGINE 3 and the Crysis 2 SDK, this weekend gives you a chance to get back in game and earn some extra XP between different mapping and modding projects!
There are no restrictions on game modes or maps (excluding custom maps), so grab your friends and earn some new gadgets and guns... and lots of XP, of course!
So there you are, here's your chance to close in on the "Crysis, What Crysis?" achievement:http://www.trueachievements.com/a148454/crysis-what-cry....htm
Depending on your point of view, that's either a misquoted politician, a superb prog rock album by Supertramp, or your intended goal before this coming Monday.
Whilst we have your attention, US gamers should remember that this title launched March 22nd this year, so you're eligible for the "Dedication" achievement.http://www.trueachievements.com/a148460/dedication-achi....htm
European gamers will be eligible for this from September 25th.