I mean, by completing the quests of the druids and tieflings and bringing good to all of them. I somehow get his approval in one way or another in general, sometimes it seems to me that Astarion is crazy. perhaps he was driven mad by Casador. possibly influenced by his vampire essence. but some of his actions and dialogues suggest these thoughts
Well... He doesn't really approve what you're doing. He just ignores it. x) It doesn't make him angry, but it doesn't make him happy too.
I'm also confused by "original" stories, I'm afraid choices will look ridiculous on some characters. For example, in theory, playing like Wyll you can betray grove, but this is ridiculous... As a character, he would never do anything like that.