Gears of War 2 producer Cliff Bleszinski has revealed that for the 'Seriously...' achievement, you now have to rack up 100,000 kills.
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The tally for the original 'Seriously...' achievement was 10,000 kills and it still stands as one of the notoriously tough achievements to get.
However, there's a difference. For Gears of War 2, only single player and co-op kills will count towards the total. No multiplayer included. In the original, 'Seriously...' was multiplayer only, which is one of the reasons it took so long to unlock.
Even so, 100,000 kills is nothing to be sniffed at. It's definitely going to take a couple of playthroughs to rack up the necessary kills for this one.