Another one of these? People are fooled into thinking this works..
If you have played Killzone 3 previously before having played the stand-alone multiplier, it can very well be that you already got the 1000 kills, or level required for the trophies. And in those cases they pop cause they are retro-active.
This save won't pop online trophies simply because the stats are saved on the server.
And that's the conclusion of any Killzone 3 multiplayer save...
You must login or register to view this content.
^^ The only one who said that it worked was the OP himself, and 1 other guy who never played KZ3 or KZ3MP..