This isn't really content though. And what happens during the next content drought if you fulfill all those objectives now? There's a reason I've been saving a few classes to level in later patches--so that I have something to do. Sure, there's always alts, but some people don't have any interest in alts, and that's also not content; it's just repeating stuff you've already done. Fun for some, not so much for others.
Patch 4.1 was really lacking since they didn't include any Relic grinding. For anyone not interested in raiding or other niche content, there's just not much to do. Even for raiders, a lot have started unsubbing until 4.2 and statics have gone on haitus until the next tier. Because there's just nothing to keep them playing right now.
In terms of the achievements, some are an extremely tedious grind that takes a long time to complete (Centurio Tiger comes to mind), or downright impossible for the majority of players (PotD Floor 200 still hasn't been done and the only job capable of doing it is probably RDM).
Except 4.1 in general has been pretty lacking for the entirety of its duration in terms of the more casual/not niche playerbase.
It offered:
MSQ (relatively short and easily done in an evening)
Shinryu Extreme (some people aren't interested)
Ultimate (highly niche content even a lot of raiders aren't interested in)
Rival Wings (PvP community is probably smaller than the raiding community in FFXIV)
Housing (well, we all know how that ended)
The developers screwed up delaying relics until Eureka comes out in 4.25. I know they wanted the relics to be tied to Eureka, but they could have at least gotten the FATE/Dungeon steps out of the way now. It would have given people something to casually work on that isn't niche.
Personally, I've been doing older relics and working on my Centurio Tiger (I'll have that in about another 4 years), but even for those my attention is starting to wane. I've been doing PotD Floor 200 runs with a friend, and considered finally doing my solo runs (actually did a bit of it last night on RDM). But that isn't content a lot of people want to do.