The achievements were fun at launch but over years they deteriorated a lot.
A with new content some new are added but it's just a fraction of their real potential:
* Crisis quests - no achievements
* Tailor - no achievements
* Ali Baba - only one achievement for completing all the adventures
* Evil queen - no achievements
* Excelsior - no achievements
* Co-op no achievements (coop loot was re-balanced few weeks ago, a nice occasion?)
* Most of old adventures - fairly simple with the new generals (although still miss a few)
* Books - invest 3 books in cleave? Rly?
* Collectibles - appear only during the events
* Expeditions - mostly ok. but few were calculated for much longer then lifetime of 'pvp'. Defending 100 Colonies is a sheer random (you can only hope, that the attacker goes afk, or has internet down).
* Scenarios - Nice idea, but since rewards from scenarios are questionable, they are not played too often (separate slots, please)
* Events - 20% of achievs come from Easter. Some extra resources are nice, though.
* Levels 51+ - Total 8 achievements for new levels, nice, when compared to others
* achievement points - does not seem to be related to difficulty