It is realistic but a bit difficult but I think Barcelona's main target right now is La Liga and it is quite possible because they are at the top of the standings now and their performance is quite impressive and also consistent.
Barcelona's squad this season is quite even in all lines and related to the productivity of Barcelona's front line, it cannot be separated from the improvements they made to be better than last season and the most highlighted is the contribution of their young player Lamian Yamal who played very well this season but it also cannot be separated from the encouragement and also the strong chemistry between Barcelona players as a whole.
I don't think Barcelona is only targeting La Liga. I see barcelona giving the same effort in every match of La Liga, Copa DelRey and champions league. Hansi Flick is interested in winning all three titles. Flick's target is not just securing La Liga.
Hansi flick is a master tactician, he knows his craft very well and what he needs to do to be able to win them all, because he's a top class coach, so I'm not that surprise seeing Barcelona competing on all front effectively, so will it be achievable?
That's what I don't know, only time we tell, but in my own opinion I believe that they can win it all, if they can be more consistent in all competition and be very ruthless in front of goals when the opportunity comes begging.
Barcelona is now in a somewhat safe zone in La Liga. The top spot of the table is occupied by Barcelona. Even if they lose a match, the top spot of the table will be occupied by barcelona. Even then, if Barcelona cannot maintain its performance stability , then they will not be able to retain the top spot of the table. Real madrid is continuing to try to regain the top spot of the table. Only if Barcelona's performance is irregular, we will see Real Madrid at the top of the table..
The best thing that Barcelona can do to themselves is to know that they have not won anything, because at this point they can still lose everything if they feel complacent, besides why would they feel very relaxed, when they are just topping Real Madrid just by goals difference or possibly three points if they can win as osasuna in their outstanding fixtures, so having that feeling that they have not won anything, will be the best thing they can ever do to themselves.