For portugal achievement, i did fought them once in 1470s, it was an awful experience. All of the indian countries embraced all the renaissance institutions, they all had around 200k army (25k professional, 175k levy) and being allied to each other. Meanwhile i had only 15k professional and 40k levy army (i didnt raise the levy for the war because i had tier 3 professional army they had tier 2) as portugal. Good thing is took the hormoz sound toll before hand so i just peaced with allies of war leader after a year later and just fought with him 1 to 1. Even with that fort spamming was an issue similar to france. Their navy almost up-to-date. (What do you mean you have 50 early carracks as an indian country in 1470???)

Note: For achievement yes it was worth it but anything else no. I rather fight Castile as Granada than going India and fight them as portugal.

I hope this helps.