The SCHWARTZ 00 said:I don't think you have to worry about that. They said the hidden 4 achievements will be love letters to the community. Most likely they'll be easter eggs or something silly as an olive branch after the hellish grind they put completionists through over the past couple years.
15G - Complete Seriously in Gears of War (360)
15G - Complete Veteran Gear in Gears of War 2
15G - Complete Seriously 3.0 in Gears of War 3
15G - Complete Sybarite in Gears of War Judgment