First of all I just wanted to say I appreciate the work and effort that's gone into this update - good or bad, people have spent their time working hard towards something they thought was a good idea (benefit of the doubt, friends). And I do think the art for the achievements are actually real cute! The screen-sized pop-up however is a bit much when compared to the notification system everyone is more comfortable with. But as people have said, we're getting bombarded by so many because they're the easy ones and our cities are mostly developed by now.
On the point of achievements however, I have to say FoE isn't a gaming platform like Newgrounds or Steam - when an achievement system is implemented into a game, it ought to have some sort of practical use no? Special buildings, goods, avatars, buffs, boosts, or even a fancy title you can attach to your name makes a lot more sense than a display case that only serves one's vanity that can otherwise be satiated through many other means (watchfire x100). The point of achievements in-game is to be rewarded. When achievements are added just to say "Look at what I did!" it's seen as the sort of trite ploy used by gaming platforms to induce spending or feign a sense of community - something FoE does not need to pretend with. It especially doesn't help when one of the achievements involves losing - again if one doesn't even get a funny title for it, it's just grasping straws. (I wouldn't mind being Raevynherst the Training Dummy for losing 500 battles)
As for the boost overview, I imagine the rationale was to make it clear in-game that the new page existed, which I understand if that's the case. But setting it as the default page was overreaching I think. Many people have said the news tab is most important, and furthermore, it's pretty obvious that there's a new tab there that no one has ever seen before. I'm also surprised the boost info wasn't added as a drop-down list like the happiness indicator is. I say get rid of the boost tabs to the right (with the specials and deals) and have a drop-down next to the happiness indicator that displays boosts in a concise list-format. Otherwise the overview and the tabs pretty much tell the same story. That's a redundancy in information display - one of them has to go.
Overall I'm happy with the interest in achievements and attempt to finally organize/visualize info re: boosts. However I think both could be much, much more meaningful in practice.