See subject line. There are some achievements that are just a pain due to low zone populations such as the one for killing wandering world bosses in deadlands. During non event times that is almost impossible unless you can solo them and soloing an NPC with 15 million health 30 times is not fun. Or the same for dragons in elsweyr for example. There are many others.
I've gotten all those hard ones out the way, ended up waiting for last years deadlands event. It seems it's not a far stretch to help players who need the help by adding things like this.