My DH is like this sometimes. When he has done something in the house ..... (Not that often, but occasionally.)
But yeah, sometimes when he cleans the kitchen (for example) and wipes the worktops down, etc (when I am out shopping or something,) he will say 'I've saved you a job!' with a massive
And 'is that clean enough for you?' And my personal fave 'Took me 2 hours this did, coz it was filthy.' 
I say 'Funny that, coz I only gave it a good clean 3 days ago, that took ME 2 hours!' Then I say 'Maybe you should completely take over the kitchen cleaning duties!' 
'Oh no, I wouldn't wanna take your little jobs from you he says.' 
He is lucky I don't tip a carton full of milk over his head!
ALSO, when he says something remotely funny (which is rare as I am the funny one!) I laugh, and he says 'did ya like that? Was that funny? That was funny wasn't it haha!' 
Errrm yes, but you don't need to go on about it! It's like he NEEEEEEDS praise.
He also has this habit - when I do something stupid or clumsy - of taking the piss, and telling EVERYONE we meet about this 'hilarious' thing I did. Thing is, 4 times out of 5, it was silly/funny/worth a ribbing at the time but 2 weeks later, when he has told some 10 or so people, it's worn very thin, and quite honestly, the occasions are often a 'you had to be there' kind of situation, so most people just look awkward. I don't do the same to him. I wouldn't DREAM of taking the piss out of a daft/clumsy thing he did, as I am not an arsehole who laughs at other peoples expense!
Don't ask me why I'm married to him! I don't fucking know! 
Seriously, he's not a horrible person, just a bit of an attention seeker, and quite insecure, and these things rarely happen compared to the nice/good things he does! 
@theviceofreason
Be blunt!
"Do you want a medal? Look, I appreciate you having done x, y or z - but these are normal things that adults do. You've been banging on about it for 25 minutes now."
This. Brilliant! This should not be a dealbreaker (as a few have said,) but it needs sorting, as it will get very annoying. As I said, my DH doesn't do it THAT often, but it is annoying when he DOES do it.