With the newest version of the Twilight Forest mod, the ingame achievements server as a way to add progression to the mod, preventing players from fighting certain bosses or going to certain biomes too soon. The problem is that the first achievement is to make a twilight portal. Going through a vanilla portal will give you both that and the twilight arrival achievement, but using the portal plugin does not. What I'm suggesting is putting a twilight portal at spawn on each node, not just node 1 since achievements don't travel from server to server. If you want to make players still have to unlock the twilight, you could bedrock up the exit of the portal, so to make it purely an achievement fix and not a jump-ahead. Please help us fix this. The twilight forest can very easily kill you for not having the right achievements, and it's impossible to fully enjoy the mod without being able to access 80% of the dimension. ~B3Wall
If you have the portal achievment you will not be able to get the other achievements as the bosses are too fast death.
I just tested the twilight forest with disabled progression again and it seems to work now, at least on infinity.