All I know is to get the first achievement you have to click all the tabs at the bottom of the screen. Hope that helps :)
Win the levels
there are no secret achievements
2 achievements were that the Aztecs conqured land and they won a war with the mayans
by dying
One is Gem Craft Chapter 0
Epic has said that they will not release a PC version of Gears of War 2.
epic studios with the help of Microsoft
beat level 12
world war 2
Beat 12 Level
beat the last level
Achievement List:Hobbits: View instructions and creditsDwarves: Load the game 3 timesBomberman: Lose 3 gamesRed Dragon: Beat level 17Devil: Beat level 18Angel Soldier: Max out the research tree for all races