Rise Eterna

For this achievement you need to max one lane of someone's skill tree with zero points in the other lane. So top OR bottom lane, but not both. It didn't unlock for my other characters because I didn't realize that, but when I got Eana, she has enough points to max the top lane. So I unlocked everything and maxed them, ultimate skill included, and then when I pressed and then to confirm, the achievement unlocked.