I'd be grateful for answer because I'm in progress of doing the same achievement.
: Ninety-Nine Nights, Enchanted Arms, Prince of Persia, Wanted:WoF, Lost: Via Domus
: Aegis Wing, Pacman C.E, UNO, Soul Calibur, Galaga, Castlevania SOTN, N+, Rocket Riot, Magic: the Gathering (first in Poland :P), AfterBurner Climax, P.B Winterbottom
10k reached - 24/08/08
20k reached - 18/02/09
30k reached - 06/07/10