Siliconera took note of the achievement (er, Trophy?), pointing out that the collection spans a modest assortment of TurboGrafx-16 and Neo Geo games, but for the most part it's made up of PS1 titles.
Comparatively, the North American Store carries a considerably lighter load of 127 "PSOne Classics," 13 "PSOne Imports" and 10 Neo Geo games, according to our count. The EU Store is lighter still with just 96 Classics and 10 NeoGeo titles. So, yeah, Sony's a little behind on hitting that 7,000 milestone (by the end of 2007), but it's complicated, right?