After a lot of tries that my mind can handle, I just go to a WL0 guy and make all the way to Natlan I telling the host to follow me so he can unlock some waypoints in the process and some chest, bro was literally happy to know more regions and I got my achievement and that namecard. And yes he add me at the end as a friend.
So what I learned here that all characters (even in co-op) should dodge the shielded turtle attacks. I tried that earlier, I was able to dodge all of the attacks but my teammates didn't. So after we killed it, no achievement for the 3rd condition since my teammates got hit.
A player came to mine and asked if I did that yet. So we went there and did the saurian trick. I have Furina that send out 3 bubble guys. Took a long time but did it.