I feel like Plutonium should add achievements to all games in general, because all games need to have an accomplishing feeling to them and I don't think getting your killstreak in CoD for the 1000th time does that and in most games it's there so I think it should be added too.
I am not accepting money for this I just think its a good Idea to put in the games.
For the achievements maybe put a mix of steam achievements and a bit of your own Plutonium achievements.