Pretty sure I already saw that, but can't find it. (must have been the old forum)
at any rate, its a good idea, one I'm wondering why it wasn't applied yet.
Nearly every game have those, and often they provide a fun challenge to give to yourself. Additionnaly, a players acheivement should be displayed in the ranking/ HoF.
Now however, acheivements must be acheivements. While I have no problem with a few basic easy one, many should also be quite hard to reach.
I know we had this system in two fleets I was part of, and it did encourage people to perform due to peer pressure.
And strangely, I'd very like a few "epic fail" awards. Might be interesting to see some people's reaction if the game system identify them as failures to improve.