Do the YoA achivements if I can't finish?
there is a quote from a dev somewhere here that says there will be a season 5. with that in mind do some but don’t kill yourself over it
The issue isn’t if there will be a season 5 (we know there will be), the issue is if season 5 will continue on from season 4 or if we will have completely new achievements to replace the current system. If the achievements continue, then it’s worth doing them now since you will continue working on them next season. If they are new, then there is no point doing them since the progress (and especially any tickets you spend) will be wasted.
From what i recall the time frame was 4 seasons but that there would be a way to get backpiece after that. However, since ANET said they would be revamping the Match Making for Season 5 completely and looking into the skill vs grind factor i believe it will be very different in S5.
“Buff my main class, nerf everything else. "