Guild Wars 2

Will you be able to play the living world season 2 quests (and do achievements) when 3 comes out?

I think so. Its all instances so leaving it in won’t affect LWS3 content at all. Plus some people have paid money for access to lws2 so I don’t think Anet should remove that access by removing the content.

If you’re asking if you get LS2 unlocked for free when LS3 is released; unlikely.
You can play the story if a party member opens the instance, but achievements are only available with the gem store purchase.

I forgot to add i already bought all the episodes. I just cant play the game atm and dont wanna think i just wasted ~1k gems for it.