...against the middle 52 (20)

Switch sides in Bowa-Seko - the Southern Territory

• 329 tracked gamers have this achievement (15%) 2,211  

Messenger 29 (10)

Complete all the available Underground side-quests in both the North and the South

• 265 tracked gamers have this achievement (12%) 2,211  

Dr Livingston, I presume 49 (20)

Enter every 1 square kilometer map region of the world

• 370 tracked gamers have this achievement (17%) 2,211  

Fallout 3712 (460)

26 achievements out of 50 won | 4,476 tracked gamers have this game | First played 05 Jan 09

Prince of Persia2148 (1000)

50 achievements out of 50 won | 1,656 tracked gamers have this game | First played 05 Jan 09

Tomb Raider Underworld1718 (1000)

31 achievements out of 31 won | 876 tracked gamers have this game | First played 05 Jan 09