I have problems with 2 achievements, wich didn't activate correcly after completing the requested quest: "Shrieker" and "The Doppler Effect".
Maybe also other achievements wich should trigger after completing a contranct aren't working too, like "Fearless Vampire Slayer", but i'm not on that quest yet.

I've killed the Shrieker just this morning, and I've got the achievement... maybe it was due to connection problems... qua in Italia succede fin troppo spesso -_-"

Aren't they supposed to work offline? Better speak in english, even if i can understand you. it's still an international forum.

And... i have Fastweb 20Mb, wich for an italian connection it's pretty good. and i'm sure i was online, i was using Spotify.
I don't think it's a connection problem.

No, the achievements only work online, like on Steam.
On Steam, though, if you obtain an achievement offline it will be credited to you once you return online and load a game. Since Galaxy is still beta, it doesn't work like that for now.

And about the language, I know I have to speak english here (I do in all my other posts) but sometime I like to speak my language when talking to other Italians ;)