Well, there are achievements with all 4 factions. When do i have to decide finally, with whom i cooperate, like a point of no return? Because i don't want to play the whole game again, only to get the other achievements.

There is a very dramatic and obvious cutscene in the Queen's Palace that makes it absolutely clear that you are about to hit a point of no return.

The Queen even says explicitly that it is time to stop playing privateer, that any of the factions can help you with the final goal, and that you must choose one of them.- your quest log also says this, and mentions a fifth option.

This is where i'd suggest the hard save if you want to do all four, because each faction will open up their last quests at this point and it finally becomes possible to lock the others out if you're not reading carefully.

Edited May 16, 20187 yr by Luagha